If this is the general spirit of piracy, I don't know if I'm interested

I don't use soulseek but no, I certainly wouldn't describe that attitude as the general spirit of piracy. I'm mostly familiar with the private torrent trackers. While I've certainly come across fascists (EMPRESS is a good example, they're pretty explicitly transphobic and include a bunch of slurs in their nfo's), I generally come across plenty of libs and even some anarchists and communists. And based on events and how the private trackers are moderated, the staff, at least on the sites I use, they seem pretty alright. For example, I know of at least a couple trackers that ran events for pride month.

And from hanging out in leftist spaces, they seem especially cool with piracy. They're anticapitalist after all, so it shouldn't be a surprise.