Depends on your OS, but symlinks can do that for you - file exists once, but multiple “files” link to it. The application (torrent client) doesn’t care.

If windows didn’t exist, linux would dominate with the problems you describe, and we’d still see this meme, but advocating for FreeBSD instead.

That being said, I like them both. It’s been a while since I last used bsd, so I think it’s about time I give it another spin.