what different networks or protocols does exist?

Why not use SimpleX Chat? If you use Matrix for that you will likely get reported and get banned

That sucks, i don’t know if a XMPP client + Tor/Orbot would be a good alternative

I use i2p for torrenting and it works pretty well… except for the download speed (because i2p is a anonymization software, obviously, so it’s gonna lots of tunnels…) I recommend tracker2.postman.i2p if you want a torrent site on i2p (everything on there is safe)

Same, last time i tried iMule it just didn’t work… i don’t know if this has to do with using i2pd instead of regular java I2P