GDPR and Consent Mode
The European privacy regime requiring explicit consent before non-essential analytics and advertising cookies are set, and the technical mode that lets measurement continue in aggregate once consent is refused.
Analogy Mental model
Standing on the doormat and asking whether you may note down which shirts the host looked at. Only after they nod do you take out the notebook.
In practice What you actually do
For any site serving European visitors, deploy a certified consent banner and configure the current consent mode. With the advanced implementation, a refusal still permits an anonymised signal to be sent, and modelling estimates the traffic and conversions that measurement would otherwise lose.
Where people get burned Pitfalls
Without the advanced configuration, a large share of European visitors decline and roughly half of that market's data disappears from reporting. The loss is silent, which is what makes it dangerous: the numbers look normal, only smaller.
This entry was written in English from the Chinese original, not machine-translated. Read the Chinese version →