Twitter no longer censors right-wing people like in the past, so there is no need for them to switch. Twitter still doesn't censor left-wing people, but the left-wing people preferred the previous situation where right-wing people (their political enemy) did get censored. So many of the left-wing people were upset with the subjectively worse situation, so they switched to Mastodon, which is why most of Mastodon is very left-leaning.
You are so invested in the cultural wars, you didn't even stop to think about I asked and you rushed to find a rationalization to explain the current situation.
Some more questions for you to ponder:
- why hasn't the right wing got out of Twitter when it was dominated by the left?
- why was Mastodon popular for the woke leftist crowd since, I don't know, 2020?
- Jordan Peterson is still complaining about YouTube censoring/blocking/demonetizing his videos. Why doesn't he make his own Peertube?
Does it matter? It didn't stop Trump from creating Truth.social, did it?
Why couldn't other right-wing influencers get together and do something similar? Perhaps because there never was actual censorship?
Perhaps they just attracted more suckers to support them by bitching and moaning about "censorship" and "deplatforming" than if they went on and actually took control of their own social media presence.