The only reason that Trumps haven't moved to gab is because Wikipedia says it's a Nazi website, that is literally the only reason why.

Gab is an American alt-tech social networking service known for its far-right userbase.[8] Widely described as a haven for extremists including neo-Nazis, white supremacists, white nationalists, the alt-right, and QAnon conspiracy theorists, it has attracted users and groups who have been banned from other social media and users seeking alternatives to mainstream social media platforms.[22] Gab says it promotes free speech, individual liberty, and "the free flow of information online", though these statements have been criticized as being a shield for its alt-right and extremist ecosystem.[33] Researchers note that Gab has been "repeatedly linked to radicalization leading to real-world violent events".[34]

Literally the first paragraph of the Wikipedia article, so much political nonsense rolled into one, not to mention a clear smear tactic that monopolistic tech overlords have used to suppress their competition.