In fact, most of the problems stem from the fact, that the EU did not agree on a new cookie law (ePrivacy directive), which promised that you can set your prefe

In fact, most of the problems stem from the fact, that the EU did not agree on a new cookie law (ePrivacy directive), which promised that you can set your preferences once (e.g. in the browser) and make sites agree to them. But no, lobbying was big and the law was delayed indefinitely. GDPR was never(and never intended to be) a technical law, it is by name "general"! You get the same "notification" if you walk into a public space where security cameras are installed.