Twitter is not a natural monopoly, not a monopoly, and it's not even clear that it will remain the incumbent leading platform.
Do you believe every website should be shut down if they don't have a comments section on every page? Should Google be forced to abandon PageRank because it censors shitty content?
Perhaps the core problem is that the "comment box" is a fundamentally unscalable tool. Instead of putting up a piece of content and letting everybody slap whatever they want on the end of it, maybe everybody needs to be given their own space, with no comment box. Maybe people should have to active seek out "comments" without having it pushed into their face. If "someone" built a system around that idea instead, perhaps we'd get a more stable structure.
(This, incidentally, harmonizes nicely with my other post that if you want to make money on this, you need to fundamentally rethink the whole situation and the entire incentive structure, not just create "X, but without ads!")
The mall owners probably like free speech as a concept and may even be anti-abortion themselves, but people yelling and waving objectionable banners around upset the other customers and are interfering with the business the mall owners are trying to operate.
> and you can't easily move your followers
So you mean people will keep using Twitter even if they delete some tweets?