Also tixati is a very good client but people keep using uTorrent,even with ads,or if they want to change they choose qbittorrent
tixati has a good interface but devs don't talk with use,they are not interested in the featues we want
That's not true, most people stick to utorrent because it has a simplistic GUI and it works OOTB, and when they switch, they switch to something simple that resembles utorrent. Tixati has a very complex GUI, at least for non savy users. I'm talking from experience, when I first tried Tixati(a long time ago), its GUI scared the crap out of me, eventually I move to it because of a unique feature which I could not find on any other bittorrent client, and eventually I adapted to Tix's complexity.
And no, Devs are not just putting their users aside, some features are worth to implement, while others not so much. It's a matter of usefulness and popularity.
As for Fopnu, it's similar to Kazaa, eDonkey (or eMule), etc... But decentralized.