Idk if this is still the case, but I pirated a shit load of psytrance with DC++ back around 2005-06. Might be worth checking there, or maybe soulseek. I can’t vouch for soulseek personally but a ton of friends love it. I find with more niche things like more obscure electronic music peer to peer beats the pants off torrents.
Shout out to my first rave, caught Infected Mushroom in Montreal during the Classical Mushroom / BP Empire era. Been a fan of psytrance and a good uggadugga bass line ever since.