This, very much this. I've been having more pleasant discussions with random people replying to Mastodon posts compared to the brain parasites victim making their nest on xitter.

"Influencer" is just a word to describe a phenomenon that will naturally arise on any platform where following someone doesn't require a follow back: some people will have a lot of followers, for whatever reason. They've existed as authors and columnists, radio personalities, television and film celebrities, podcast hosts, etc.

Some grow followers organically on the specific platform, while others bring their followers on from being independently famous outside the platform. And it doesn't matter if they don't start off as famous - all it takes is for a post or comment to go viral and then the attention is there, whether the creator wanted it or not.