Free speech does not cover scams and fraud, something that happens on their platform. Society doesn't take any action against them for publishing illegal content, scams, libel, fraud, because they aren't a newspaper. They're more like a newspaper printing house.
In my opinion they should probably be losing those protections and should suffer legal consequences for the content their users post. The moderation has reached a point where they ate defacto editorialising content.
An alternative to that could be opting in to some kind of third party moderation arbitration process.