Same problem the American media industry has: make a centralized platform that is a reasonable cost and isn’t super hostile to consumers
When Netflix streaming and music streaming first came out piracy started to die out. They are both somewhat hostile to consumers (drm, shitty apps, locked ecosystems, initially couldn’t do offline content) but are at least not hostile enough that the average person doesn’t care. Torrent site active membership started to drop noticeably, especially among American users.
That’s why you can see a difference now - media streaming is a pain in the ass again with price hikes, decentralized platforms, obtrusive advertising, etc, and torrent sites for tv shows and movies are starting to see users come back.
Music sites don’t see the same growth in daily active users though because the music industry has kept music streaming mostly fine. Whether you have apple, spotify, tidal, etc the catalog is mostly the same, comprehensive, and usually ad free if you pay.
Anime and manga sucks; it’s not terribly expensive but it’s yet another cost ($8 mo for crunchyroll, $6 for hidive minimum), the library is already fragmented between crunchyroll/hidive/netflix/etc. the licensing is stupid because Japan’s licensing and copyright stuff is even worse than the us so shows and manga disappear. The localizations range from very good to absolutely terrible and if you’re not in the right mind and actually use dubs they’re often just trash. Not to mention that crunchyroll is a piece of shit company that was built off making hundreds of thousands of dollars by pirating anime with other peoples fansubbing and fandubbing