Torrents still exist. Literally all you need is a file hash.
There's this already, though I'm not sure if it's still working Dtan.xyz
Discussion
For the gaming side of things, DDL exists, and I have to use that instead of torrents (plus, it's actually better in most cases for me due to bandwidth).
DDL does have the benefit of less bandwidth usage. Torrents have the benefit of bypassing the gatekeepers and being decentralized. Everything has it's tradeoffs. Some combination of web seeding with blossom servers plus some adapted torrent tech could be interesting, offering the best of both worlds.