I'm sure you have a very coherent argument for how platforms can do any sensible sort of censorship at all without collaborating with the IP holders, at which p

I'm sure you have a very coherent argument for how platforms can do any sensible sort of censorship at all without collaborating with the IP holders, at which point the 17.7 et all would apply. In the end though, it is the ECJ that will decide if your head canon has any relevance for this topic.