Eh, I'm just assuming OP holds views that a lot of people here disagree here with (thus end up getting downvoted), and writes it off as "not allowed to say it" here. That's usually the gist of why people complain about freedom of speech nowadays, regardless of their ideology. Yes, I understand there are billions of exceptions, and I understand how users get banned for "wrong think". But that happens literally everywhere, and all you have to do is to be loud enough to piss of the right people.

Everyone wants to be liked, and search for the venues where they can express their views where they would be a part of majority. Basically the reason why people skew towards echo-chambers, in real and digital life.

One example from yesterday of “what can’t be said”:

https://news.ycombinator.com/item?id=42630197

or

https://news.ycombinator.com/item?id=42630067

Or let’s say, it technically can be said, but you get somehow punished (flagged, downvoted, etc) so you learn not to do it anymore. The incentive is simply not there.

There is a logic, the “community” flags to protect their own interests (financial investments, friends working there, etc).

And since the community is from the same group, they defend the same interests.

The more freely we can talk about a topic, the more genuine and thought-provoking interactions it can create (without intentionally hurting the others obviously).

If you filter too much, you get this LinkedIn-bullshit and it makes a message board super boring, as you live in a closed bubble.