I don't care what happened to Twitter now that I'm off it, but having an egomaniac not only owning but actively controlling, answerable to no one but himself, the most important digital public square in the world, is very problematic from a democratic (not the party) standpoint.
> Anyone who cares can build a replacement.
Technologically, sure; nothing special about it. But in terms of adoption and reach, no, Twitter is unique and extremely difficult to replace.