I never did entirely figure out Mastodon. Or maybe I did, but it wasn't worth the effort. Like I say, if it requires someone to tell you 'it's easy,' it – by definition – isn't. Despite claims to the contrary, very few people left Twitter, not a surprise since the point of Twitter seems to be for people to promote their own virtue (there's little point putting it to Elon if he's not watching, damn it). I occasionally take a peek (partly for work purposes), but the signal-to-noise ratio doesn't make prolonged contact any more enticing than a tea party with ebola. It mostly seems to be a tidal flow of mobs. I figure if they invented a filter that excluded anyone with a mention of a football club, their pronouns, or anything Brexit related, it would be heaven. But again, defeating the point of Twitter, which is a mob barney.
If Twitter were to evaporate, the world probably would be a better place. Journalists might have to write stories that don't consist of stuff people said on Twitter (they might also realise that opinions on Twitter aren't representative of the real world).
Like all social media, it was a bit random win-out, but there's not a lot of space for other platforms unless they're happy being niche. I still don't want to read about Darren's novelty underpants. I've got a strong feeling he's on Mastadon though.