FR is not "public square" social media, which is what the issue is here.
I dunno.
One can easily sign up here, and if reasonably well-behaved, stay for a while.
Willie Green comes to mind.
But there is court precedent for a private business to be considered “public” - such as the public areas of a mall... and can be required to permit first amendment activities. This is the angle that should be pursued with the big ones, YouTube, FB and Twitter. They are in every sense of the word, the new “public square”. They are so large as to have effectively taken over public discourse.
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FR is not “public square” social media, which is what the issue is here.