You need to lodge a complaint. It’s time consuming so almost nobody do it.

And generally, it came with a slap of the wrist, and the company put up the banner.

For a site to be blocked, it need repeatable, multiple and not correctibles infractions.

Has it ever happened, even once? Can you cite something? I'm genuinely curious. Also genuinely skeptical.

There has never been a case where it was escalated so far.

This. Each country have an administrative entity (in France, that’s CNIL, Commission National sur l’Informatique et les Libertés - National Commission on computer and liberties, roughly) in charge of this kind oh things. You can lodge a complaint to them and they will investigate and eventually, if needed (don’t think it was ever needed, they can bring the problem to a judge.

I have a very difficult time imaging that companies in China (or even the US) will even read a message in French, much less respond to it.