Either adaptability/organizational ability, or some form of chaos. Under the specific environmental conditions of earth, one set of outcomes are favored, but under other conditions different outcomes are favored.
And the interplay of these outcomes and mutations can result in novel adaptations. Or something like that ¯\(ツ)/¯
Haven't used soulseek in about a decade, so things might have changed, but back then my workaround was this: I search for what I want, find a person who's sharing it, and if their library was good I'd allow them to see my library before downloading from them.
So basically I'd share with folks I downloaded from, but not the general public. Not foolproof, but drastically reduced chance that somebody with a well-curated library was there just to prosecute.