[int_19h]

There was an interesting case of that in Australia recently, when ISPs colluded to block a bunch of websites that wouldn't take down the Christchurch shooter's manifesto (some of those were forums with very liberal rules on what goes, and their members posted that content). There wasn't any law or government directive or anything like that, not yet. But there was also nothing anybody could do about that, since it was just a bunch of private companies exercising their judgment.

Whatever you think about their cause, you should be worried by the precedent set here. This is censorship at the same scale a government might do, but snuck in through the backdoor, and completely outside of any democratic mechanisms.