What about the 'discovery' that Google Analytics is illegal under GDPR? Not raised even once right up until the moment the courts decided it.

EU privacy law is so vague that people routinely 'discover' new impacts of the rules only when some judge pulls them out of thin air. The fate of EU tech firms is pretty much well described above: endless agonizing over how these rules might be interpreted, followed by maximally damaging interpretations, because the nature of such law making is that enforcement is arbitrary.