I think the key thing (which we used to understand but seem to have forgotten) is that restrictions (including censorship) should be based on conduct, not opinion. Someone spamming commercial links, crap flooding, posting child pornography, even constant off-topic posting etc can justifiably be censored on a platform based on their conduct. But as soon as you advocate for censoring someone purely based on an opinion then you're making it dramatically easier for someone who shares your opinion to be censored later on. Although if we're being intellectually honest, even if there hadn't been any banning of wrongthink in the past, this kind of thing might still have happened anyway given the current administration and their allies. But it's definitely made it easier.
I remember when Alex Jones (or someone of that ilk) was being "de-platformed" by Google, Facebook, etc. Not only were people cheering for it, they were denying that being banned from YouTube (for example) was censorship since "there are other video hosting platforms" (yeah, there are but also not really) and "it's only censorship when it's the government who legally restrict you from speech".
(And Alex Jones is a detestable piece of shit just in case you think I'm a fan. But to paraphrase an old saying, freedom of expression is only a principle if it applies to people you utterly despise).