At some point, platforms need to realize there is a moral value in allowing different view points so that they can discuss and be seen. Otherwise, people leave for more "open" platforms that breed exclusive extremism. It then further divides the split.
The other issue is that these platforms are so big that they literally dictate narrative in many cases, or at least to their audiences.
If the banned go to Gab and 4chan, then there is no "monopoly" on distribution. The Constitution is what allows for the alternative options to even exist. It's GOOD that we have the alternative options. That's not a "bad" thing.
And what is wrong with people going to "open" platforms that "breed exclusive extremism"? I don't see anything Constitutionally wrong with that. (Keep in mind, you or I not liking something does not mean it should be Constitutionally restricted.)
In my view all these arguments people are making about "open environments", or "bad faith actors", or extremism or what have you are completely irrelevant. A privately owned, NON-governmental, environment is allowed to be as "open" or as "closed" as they please. If a "bad faith actor" wants to act in "bad faith", (whatever that is?), then that's their prerogative. That's their Constitutional liberty. (You ever consider this? Who, exactly, is defining what "bad faith" is anyway?) And extremism in content is fine, you don't like it, don't look at it. (Or in Facebook's case, don't have it on your system. That's fine. That's FB's Constitutional liberty.)
The Constitution really does provide room for obvious solutions to all of the arguments people are making. There's really no need to get bent out of shape about a lot of these things.