I think the problem you're talking about is solved by super-seeding. https://en.wikipedia.org/wiki/Super-seeding https://en.wikipedia.org/wiki/Super-seeding I

I think the problem you're talking about is solved by super-seeding. https://en.wikipedia.org/wiki/Super-seeding https://en.wikipedia.org/wiki/Super-seeding I believe libtorrent supports it, among others.