> A website ban isn't even remotely the same thing as a legal sanction.

The Supreme Court seemed to have very different take (Packingham v. North Carolina):

"Social media allows users to gain access to information and communicate with one another on any subject that might come to mind. With one broad stroke, North Carolina bars access to what for many are the principal sources for knowing current events, checking ads for employment, speaking and listening in the modern public square, and otherwise exploring the vast realms of human thought and knowledge. Foreclosing access to social media altogether thus prevents users from engaging in the legitimate exercise of First Amendment rights."