I think there are three groups. There’s the tankies that got deplatformed and created Lemmy to have a platform with no corporate owner. There’s the reddit refugees who wanted to get away from corporate controlled social media. Finally, there’s assholes who got deplatformed because they’re assholes. They aren’t philosophically in favor of the freedom of the fediverse, just that it gives them a means to keep being bad people that no one else allows.
It does have a rate though. Each click is random, but overall they’re at a predictable rate. Still, it wouldn’t be useful for music really. I could see someone trying to make it happen though. I’ve heard of dumber things.