

Three big issues.
Usability: A lot of these alternative platforms are incredibly confusing for people who aren’t tech-savvy. You can’t expect most folks to really understand the idea of Lemmy instances for example. Bsky kind of hit the sweetspot of being super easy to use, offers not just familiar features but better features than its competitor (blocklists), while also being an open protocol. Though they’re FAR from perfect (their team is extremely questionable to say the least), and it doesn’t seem like the protocol itself is gaining traction.
Population: This is a self-defeating prophecy. We saw it with twitter to bluesky, and we’re JUST starting to see it with reddit to lemmy. The vast majority of people just won’t shift to platforms where the people they want to interact with aren’t present. They won’t move until they feel like they absolutely have to. People put off moving from the Nazi bar formerly known as twitter for literally a year - the site’s been nothing but a cesspool for ages now, but the vast majority of users couldn’t be bothered to moved to an alternative site until bsky got lucky. Hell, even now, so many people still stick to it because they’re afraid of losing engagement or some bullshit.
Algorithms: I HATE algorithmic feed bullshit, give me chronological 100% of the time, but frankly the vast majority of people have been spoonfed algorithmic feeds for at least a decade now. Going back to bluesky as an example (since it’s probably the most successful example of an alternative platform at the moment), it prioritizes the chronological feed, sure, but I’m actually amazed (and appalled) at how many people apparently only use the Discover tab. It’s a necessary evil until we can wean the general populace off of their instant gratification and endless scrolls.
The trump admins have both been a shitshow but realistically they’re just taking the problems this country has always had and is blasting them on full display, and now people are finally starting to realize this country has ALWAYS been a capitalist shithole.