I hope President Trump has at least one advisor putting a bug in his ear that this campaign won't be like the last one. The social media giants he used so effectively last time around will be pulling out all the stops to silence the voices of him and his supporters. Everyone is going to get banned, shadow banned, de-platformed, whatnot. It's going to be a massacre.
You're assuming the giants will have the same kind of credibility they had last time.