This is the same thing. This is the exact same type of platform that will eventually go the same way. This is shooting yourself in the foot once, then aiming the shotgun at the other foot and pulling the trigger thinking that the bullet was a fluke the first time.
A billionaire buys or funds a privately owned platform and does with it as he pleases, despite the obviously humanitarian route being something different. Have we really never seen that before?
Because most people switching don’t know (or care) about the fediverse and decentralization. They are regular internet users who just want to get away from the cesspool that is twitter, so they go where other people are going.