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DMA + Consent Mode v2 — click-through impact diagnostic
EU traffic flowing through Google Search has been subject to the
Digital Markets Act since 2024-03-07. The DMA limits how Google
can use behavioural data and forces consent-mode v2 compliance for
GA4 + Ads in EU. The operational effect for SEO audits:
- EU click-through-rate (CTR) data from Search Console is materially
noisier after the DMA enforcement date. Year-over-year CTR
comparisons across that boundary are not apples-to-apples.
- GA4 organic-traffic reports for EU users show systematic
under-reporting when consent-mode v2 is configured as "denied for
ad_storage, granted for analytics_storage" (the typical EU default).
Conversion modelling fills the gap, but the raw counts are lower
than pre-2024.
What the seo-google skill should do
- When pulling GSC search analytics for an EU-targeted property,
note: "EU CTR comparisons before/after 2024-03-07 are not
apples-to-apples (DMA + consent-mode v2 took effect)."
- When pulling GA4 organic traffic, surface the consent-mode
configuration if the GA4 admin API exposes it. If the property
has
eu_data_collection_disabled or denies ad_storage by default,
note "EU traffic counts are conservative; conversion-modelled
uplift may apply."
- Do not lecture the user on cookie consent UX — that's a legal
team / engineering concern outside SEO scope. Just attach the
diagnostic note.
Required GA4 / Consent Mode setup the audit should check for
- GA4 4.x consent-mode v2 wired up (
gtag('consent', 'default', ...)
before any pageview).
ads_data_redaction flag set on EU traffic.- Server-side tagging at consent transitions (recommended pattern;
not legally required).
Softening cookieless-attribution warnings
Google abandoned third-party cookie deprecation in July 2024 and
confirmed in April 2025 that Chrome will not ship a standalone cookie
prompt. The "cookieless future" framing is no longer urgent.
For audits as of May 2026:
- Do NOT recommend "switch to cookieless attribution" as a priority.
- DO recommend "implement consent-mode v2 + server-side tagging" for
EU compliance + signal-loss recovery.
- Privacy Sandbox APIs are still available, but optional. Mention
only if the audit subject is consumer-facing and has heavy
retargeting dependence.
Primary sources
- DMA enforcement: https://digital-markets-act.ec.europa.eu/
- Google's third-party cookie reversal: https://privacysandbox.com/news/privacy-sandbox-update/
- Consent Mode v2, EEA consent updates: https://support.google.com/google-ads/answer/13695607
Last verified: 2026-05-17.