Your competitors' ad mistakes are your opening: dead pages, ended offers and sold-out products

Most competitor research looks at what a rival's ads say. This post is about where they lead. You can see any competitor's active ads in Meta's public ads tool (how to do that, for free), but the tool does not tell you whether the page behind the ad still works. That gap is where a rival's mistakes hide, and where your opening is.

What we found when we followed the ads

RivalSweeper follows the live Meta ads of the stores it monitors through redirects and tracking links to the page a shopper actually lands on, and records what that page returns. Of 5,896 live Meta ads whose landing page RivalSweeper checked between November 2 and 4, 2026, across 43 stores, 52 (0.9%) led to a page that returned "not found". In that RivalSweeper check, those 52 ads came from 8 of the 43 stores.

A day later the picture held. A RivalSweeper re-check on November 5 found 60 such ads among 6,202 live Meta ads (1.0%), from 9 of 43 stores. In that RivalSweeper re-check, two stores, one in beauty and one in fashion, accounted for 47 of the 60.

The surprise was why. In RivalSweeper's November 5 re-check, 43 of the 60 error-page ads, from 3 stores, pointed to a page that was working fine: the link pasted into the ad carried an invisible character, such as a zero-width space, so the store answered "not found". Nobody on those teams would see it by reading the ad. The rest were pages that really were gone. The 9 of them that pointed to a product page had been running for a median of 63 days in that RivalSweeper re-check, and the oldest had started in September 2025: the product page was removed, and the ad kept running.

So the mistake is rare per ad and common per store. Most stores get almost all of their links right, yet about 1 in 5 stores in RivalSweeper's November 2 to 4 check had at least one live ad sending shoppers to an error page.

One more number keeps this honest. In the November 2 to 4 RivalSweeper check, 547 of the 5,896 ads (9%) could not be checked because the store blocks automated visits. RivalSweeper counts those ads in the total but never as broken, so the real share of dead links could be higher than 0.9%.

How we counted: an ad is live when RivalSweeper has seen it running in the last 3 days. "Error page" means the link returned "not found" or a similar client error, or its domain no longer exists. Links to app stores are left out, because they open an app, not a web page. The stores are ones RivalSweeper monitors, mostly fashion, home and beauty retailers, plus jewelry, electronics and a few others; they are not named here, and RivalSweeper never publishes which brands have broken or expired ads.

Why a rival's dead ad is your opening

A shopper who clicks an ad and lands on an error page has already done the hard part: they wanted the product. The rival paid to bring that shopper in and lost them at the door. Here is how you can make the most of it, fairly.

1. Be the working page for the same need

Look at what the dead ad was selling: a product type, a category, a seasonal edit. Then check your own version of it. Is your page live, in stock, and reachable in one click from your ads, your homepage and search? A shopper who bounces off a rival's error page may search again, and the store with the working page is the one that can get the second look.

2. Put budget behind the same intent

If a rival's ads for a category keep landing on dead pages, that category may have shoppers they are not serving well. That can be a good week to raise your own spend on it, in your own words and on your own product terms. Compete on the need, not on their brand name.

3. Time your promotion, and don't match a deal that is over

An ad can keep running after the offer printed in it has ended. When a rival's sale is over but its ad still promises it, shoppers arrive expecting a discount that is gone. That is a natural moment for your own offer. It also saves you money: an offer that has already ended is not one you need to match. Windows like this close fast, since the median Meta ad that ended in September 2026 had run for just 6 days, across 6,855 ended ads from brand-verified advertisers among the stores RivalSweeper tracks (How long do Meta ads run?).

4. Fix your own ads first

Every mistake on this list happens to good teams, because pages change faster than ads do. A product sells out, a collection is renamed for the new season, an invisible character slips into a pasted link, a sale ends on Sunday and the creative keeps saying it is on. Before you read anything into a rival's dead ads, make sure you are not the store with the dead ads. RivalSweeper runs the same check on your own store, and puts your dead links, sold-out products and expired or never-ending offers in your to-do list as fixes.

Six ad mistakes you can spot on a competitor

These are the mistakes RivalSweeper's Ad & Deal Health check looks for today, on your ads and on every competitor you monitor. Each ad finding carries its evidence: the public link to the ad, the landing URL, the result of the check and its date; a banner finding carries the banner text and when it was last seen.

The last one is more than a missed sale. Under the EU's Unfair Commercial Practices Directive, falsely stating that a product or its terms will only be available for a very limited time, to push an immediate decision, is a practice banned in all circumstances (Directive 2005/29/EC, Annex I, point 7), and an urgency claim that never ends can fall under it. That is one more reason to check your own "today only" ads before anyone else does.

What the check will not tell you

• Blocked pages are not verdicts. When a store blocks automated visits, the ad is shown as not verifiable, never as broken.
• Old stock data is not used. Stock or price that RivalSweeper has not read in the last 7 days is never reported as a problem.
• Landing-page checks cover Meta ads. RivalSweeper records competitors' Google ads activity too, but it follows only Meta ads to their landing page today.
• It cannot see results. Nobody outside the advertiser and Meta can see how many people clicked a commercial ad or what it cost (what Meta's public tool shows and hides), so a dead ad tells you clicks were wasted, not how many.

Where the line is

Using a rival's mistake means serving the shopper better. It does not mean making the mistake worse.

• Don't click their ads. Clicking a competitor's ads to run up their costs is click fraud, and ad platforms treat it as invalid traffic; Google, for one, lists manual clicks that increase ad costs as invalid clicks (Google Ads Help).
• Don't try to get their ads pulled. Flagging a rival's ads to the platform to slow them down is not a strategy. Spend that time on your own pages.
• Don't call it out in public. No "their link is broken, ours works" ads or posts. Shoppers remember who was petty.
• Don't copy their creative or use their brand name. Compete on the product type and on your own offer.

A 15-minute weekly routine

1. Start with your own ads. Fix every dead page, sold-out product and ended offer on your side first.
2. Scan your competitors' findings. Note which product types and categories their dead or expired ads were selling.
3. Check your matching pages. Live, in stock, priced, and one click from your ads and homepage.
4. Decide on budget and timing. Is this the week to push that category, or to launch your own offer while theirs is over?
5. Look again next week. Pages change every week, and so do the mistakes.

RivalSweeper runs the checks behind steps 1 and 2 for your store and every competitor you monitor, re-checks landing pages on a rolling basis, and keeps each finding with its date and evidence, so the routine starts from a list instead of a pile of ad links.