I found I2P much better than Tor network, and now it supports BitTorrent protocol too https://geti2p.net/en/docs/applications/bittorrent .
Why haven't the pirates migrated to I2P? Why are we still using clearnet and making people backout of seeding cause of DMCA?
The main reason is that libtorrent, which is the literal backbone of most torrenting clients, has implemented supported for I2P only recently in its latest v2.x branch.... It takes time for libtorrent to iron out bugs and stablize and it takes more for clients to upgrade their embedded libtorrent to v2.x.