Copying my own comment from below:

> "It's really difficult and frustrating to type anything outside the Overton window, and really easy and seamless to type anything inside the Overton window" is definitely a form of soft censorship worth worrying about IMO.

And as a rule of thumb, if someone says "free speech" rather than "the first amendment", 99% of the time they are talking about the concept and culture of free speech, not the legal implications.