Your tracking measures less than you think - and your “compliance” might be just a banner.
Real measurement, within the law - without the 40% myth or the fine scare.
Two problems nobody connects.
On one side, you measure less than you think: Safari, Firefox and adblockers cut a slice of client-side tracking, and your Meta Ads optimizes on incomplete data.
On the other, “being compliant” has become displaying a cosmetic banner that doesn't address what LGPD (Brazilian data protection law) actually requires.
The good news: both can be fixed - with engineering, not fear.
The same site, two different foundations.
Complete data becomes conversion.
Verified data from public studies and the law itself. Server-side recovers part of what client-side loses - a real benefit, without a guaranteed magic number.
The “death of cookies” never happened in Chrome (Google reversed it). The real measurement loss comes from Safari, Firefox and adblockers.
Server-side (sGTM) recovers part of the events. Vendor case studies show these gains - a real benefit, but not a fixed guaranteed number. Be suspicious of anyone promising “recover 40%”.
LGPD has no ePrivacy law: necessary cookies don't require consent, and legitimate interest can cover part of your analytics (with documentation). Google's Consent Mode v2 is a requirement only for EEA traffic - not for Brazil.
The most concrete risk isn't the banner: it's the international transfer of data (GA4/Meta in the US), which requires standard contractual clauses since ANPD Resolution 19/2024. Fines of up to 2% of revenue exist, but as of this material's verification the ANPD had not fined anyone over a cookie banner.
Why do Meta Ads and GA4 show different numbers?+
Client-side loses events differently in each browser; a 20–50% discrepancy between platforms is common.
Is my cookie banner OK?+
If GA or Meta fire before the consent click, it isn't. You can check in DevTools → Network.
Is sGTM worth it?+
It captures more conversions and gives your tracking a legal basis. It solves the revenue problem and the compliance problem at once.
Is your tracking losing conversions - or exposing you to the ANPD?
Run the free audit and find out, in under a minute, how many events your site loses and whether your tags fire before consent.