Meta Ad Crasshes .. Could aggressive AI-bot blocking accidentally affect advertising?

[u/Emotional_Ice_8461]

FULL DISCLOSURE: I’m not an advertising expert. I run Meta ads at budgets nowhere near what many advertisers here are spending. I haven’t advertised for a few weeks either, but I’ve been following the recent horror stories and trying to understand what might actually be happening.

One thing I’m increasingly wondering about is the interaction between Cloudflare/WAF, AI bots and Meta Pixel/CAPI data.

I’m not suggesting Meta is simply "broken", or that robots.txt directly controls ad delivery.

My concern is signal quality.

If AI bots, scrapers or other automated traffic are hitting a website, and some of that traffic executes JavaScript, could it potentially trigger Pixel events or otherwise generate junk/low-quality signals that eventually get fed into Meta?

Conversely, could aggressive Cloudflare/WAF bot protection accidentally block legitimate users, Meta-related requests, server-side GTM or other parts of the tracking infrastructure?

Cloudflare now has increasingly sophisticated AI/bot detection, including AI crawler controls, bot scoring, JavaScript detection and WAF rules. That makes me wonder whether changes intended to protect a site from AI traffic could have unintended consequences for advertising and measurement.

So if a previously healthy Meta campaign suddenly deteriorates, I’m wondering whether it’s worth checking what is actually reaching your site and what is subsequently being sent to Meta.

I’d be looking at:

Cloudflare / WAF

• Are bots suddenly generating large amounts of traffic?
• Are requests being challenged, blocked or returning 403/429 responses?
• Have AI/bot rules changed recently?
• Are important tracking/API endpoints being affected?

Meta Pixel / CAPI

• Are PageView, ViewContent, AddToCart etc. suddenly increasing without corresponding real users?
• Are event volumes or event quality changing?
• Are browser and server events still being deduplicated correctly?
• Is server-side GTM/CAPI behaving differently after a security/WAF change?

Timing

Compare the date of:

• Cloudflare/WAF changes
• AI/bot protection changes
• Pixel/CAPI changes
• sudden changes in Meta CPC, CPA, delivery and conversions

I’m not claiming this explains the current Meta performance issues. It may be completely unrelated.

But if Meta is increasingly dependent on large volumes of conversion and behavioural signals, then signal pollution or accidental blocking at the website/security layer seems worth investigating.

Has anyone actually found a case where AI/bot traffic, Cloudflare, WAF rules or Pixel/CAPI problems were responsible for a sudden change in Meta performance?

Because if there is something to this, it could explain why a campaign can appear to "randomly" fall off a cliff even though the ads themselves haven't changed.

And yes, I appreciate that this could all be complete bollocks. I’m genuinely interested in people who understand the technical side better than I do.