It's true that more people are now putting actions behind their words, and leaving Twitter for the Fediverse because of the new leadership at Twitter, but this seem to be only partly because of the right-wing turn and much more because of the instability showing just how insane it is for the world to let a social media platform be moderated by the whims of a billionaire.
I frankly think Trump is right to stay on Truth. Because what happens when Elon eventually loses interest in Twitter and sells it to someone else? That is the strength of the Fediverse to be honest. You get to operate your own servers that are part of the larger whole. This would let journalists, politicians and NGOs run, and more importantly moderate, their own "Twitter" that is still part of the larger whole. Here in Denmark it would allow our government agencies to operate a "Twitter" where all our elected officials could have an account and not have to rely on an American tech company to moderate their feeds, or risk being banned for violating American laws. Yes, the consequence will very likely be that ultra right-wing networks will be largely isolated, but that's still free speech.
https://crimethinc.com/2020/12/21/surviving-the-social-media...
The idea that there are "two sides" and that one was "in power" before and the other now, is an over-simplification.
I can't find an exact piece to quote now, but I know I saw crimethinc and/or other anarchists urging people not to get so excited about calling for twitter to ban things too, on the grounds of: Don't count on capitalists or the state to rescue us, they will much prefer to use their tools against us, and overall the power twitter has to control discourse is the problem and we've got to get off of it.