Yeah, there's an awkward boundary between freedom of speech and private property, and it's very, very hard to decide where that lies. At what point does it become wrong to decide what people are allowed to say on private property? A lot of people will say individuals can choose what's allowed in their own houses, but what about businesses? Does the small corner shop have more of a right to shut down discussions than the large private university?

It's also a massive problem with the internet in general. After all, the internet doesn't have public property, ever. Every site is privately owned, so theoretically every site can choose what to allow. But without a public platform, that also means perfectly valid ideas can be basically banned from public view by way of large gatekeepers and popular communities banning them, regardless of their legality.

Either way, it's a tricky thing to answer, since any 'solution' wil cause a lot of problems in one case or another.