To me, BitTorrent feels a lot like Blockchain: interesting tech that doesn't seem to be able to find a practical and useful application (proportionate to the attendant hype). Which is not to say that either can't, they just haven't yet. Why? EDIT: while I don't (yet) consider myself delirious, responses to this comment have illuminated how little I know about the influence and application of BitTorrent. In other word…
Why...? BitTorrent has been influential in lots of applications. If you really need proof that BitTorrent can move milestones, it help perpetuate sites like thepiratebay.org and assisted in the advent of modern day streaming services that both the music and movie industry neglected for years. It is also a central influence for p2p networking and file sharing.
I guess mobile internet was its downfall as few people want to seed from a mobile connection.