Free speech not being a legal requirement doesn't mean it shouldn't be a goal strived for by private companies creating critical communication platforms used by hundreds of millions of people. There were very good reasons why humans started championing free speech and free press. The utility of those fundamental ideas isn't limited to just governments, so I don't know why we should give Twitter a pass simply because the constitution only applies to government...
Not all good, valuable ideas have to be enforced by law either. We can create strong social pressure and promote ethical company culture in silicon valley and push (legitimately) liberal values. We can also make market alternatives, delete accounts, push for boycotts, investor activism, create value-based industry organizations, etc to put pressure on them economically.
I fear those ideals are beyond what we’re capable of at this point in the societal evolutionary cycle.
When the carrot fails, you fall back to the stick. Twitter didn’t use the stick first; it waited until the interactions on their platform turned into a shit show first.
Not all good, valuable ideas have to be enforced by law either. We can create strong social pressure and promote ethical company culture in silicon valley and push (legitimately) liberal values. We can also make market alternatives, delete accounts, push for boycotts, investor activism, create value-based industry organizations, etc to put pressure on them economically.