They ARE free to say whatever they like; their problem is that they then have to face the consequences.
I mean I can say whatever I want on this platform as well, but if I cross a line my posts will be hidden and eventually my account blocked. And that is fair, it's what I agreed to, and not only that but it's morally just.
The free speech extremists confuse freedom of speech with protection from consequences.
Interestingly, Trump and some other celebrities on Twitter have had special protection from said consequences.