> If you create a service deliberately designed so that anyone can sign up and start posting things without so much as an employee approving their registration,

> If you create a service deliberately designed so that anyone can sign up and start posting things without so much as an employee approving their registration, then you've deliberately created what amounts to a public square. That makes no sense. You can literally build something identical to a literal physical public square in the real world and still kick people out because it's private property. This is no different than that.