After rioters stormed the U.S. Capitol, forcing lawmakers into hiding and ultimately leading to the deaths of five people (six, if we count the Capitol Police officer who died by suicide in the days following), Twitter took the unprecedented step of permanently banning Donald Trump from its platform. Since the election Twitter had flagged the president's tweets that pushed disinformation about the election, but in the wake of the violence in the Capitol, concerns about incitement to more violence led them to warn Trump that he risked being banned if he kept up his inflammatory posts.
He was warned. He was given an explanation. Nevertheless, he persisted. And so Twitter followed through, as did Facebook, YouTube, and other platforms that could be used to stir up extremist violence.
And quite predictably, people who inexplicably still support the president started crying about free speech.