Once prominent celebrities and more news agencies start to come (and they will, the BBC is a sign of that) the culture will shift faster than you really realize. There is still an insular culture around the fediverse that tends to be a big barrier around entry for "normies" right now. Going on a mastodon instance as a new user with limited technical knowledge can be quite jarring especially if you step out of line of what it seen as culturally fitting for the fediverse

Lemmy isn't the only fediverse platform, Mastodon is growing rapidly as well