The unfortunate reality is that unlike us, most of the Twitter users could not care less about making choices, let alone privacy.
Twitfaces can't calm down and talk without going ballistic and you think they'll willingly look into what federated social media is?
Alot of them are moving though thanks to twitter repeatedly fucking up, I've been seeing some artists and such on mastodon recently that were only on twitter before.
People just need to spread the word; there isn't a marketing campaign or anything for the fediverse after all.