Question

Our remarketing list in Google Ads keeps shrinking over time even though website traffic is steady. Are cookies expiring faster now, or is this an attribution settings problem?

Answer 1

Yes, your shrinking remarketing list is most likely due to cookie expiration and tracking limitations, not an attribution settings problem (though that can also contribute slightly).

What’s Really Going On:

1. Shorter Cookie Lifespans

• With increased browser privacy updates (especially from Safari, Firefox, and now even Chrome), third-party cookies are expiring faster—sometimes in as little as 7 days.

• If users are on iOS or privacy-enabled browsers, Google may not be able to track them for the full 30–90 days you originally set.

2. Consent & Regulations

• In regions with GDPR or CCPA, users must explicitly opt-in to tracking. If they don't, they won’t be added to your remarketing lists—even if they visit your site.

3. Tracking Blockers / iOS Impact

• Apple's iOS updates have limited cross-site tracking through Safari. If users decline tracking (via App Tracking Transparency or browser privacy), they're essentially invisible to your pixel.

What You Can Do:

• Switch to Google Tag + Consent Mode (v2): This helps recover lost attribution signals (with modeled conversions) even when consent isn’t given.

• Set up first-party audience tracking via GA4 and link it to Google Ads. GA4 audiences are more resilient to cookie loss than traditional tag-based remarketing.

• Use server-side tracking where possible to retain user data longer.

• Segment and refresh your lists more frequently (e.g., 7-day vs 30-day visitors) to avoid stale audiences.

Bottom Line:

Your traffic may be stable, but if cookies are dying faster or users aren’t giving consent, your lists will shrink. This is less about attribution settings and more about privacy-first ad tech catching up. The fix? Shift to first-party and server-side solutions, and always re-check your tag health.