

I do the this and it’s great. An entire distro takes up only a few GB. Many graphical installers don’t support installing on an existing btrfs partition (or subvolume) and want to create a new one. This can often be solved by manual intervention (via terminal).
[…] what happens when everyone starts using it and torrents are no longer downloaded and properly seeded?
It’s already happening. More and more people stream torrents and don’t seed back which kills public torrents. Imo Debrid is not as big of an issue as they don’t necessarily tax the P2P network as much as someone only streaming torrents and automatically dumping them directly.
Additionally downloading torrents after you watched them does not make much sense as you’d tax the network without benefit (unless you seed to say a ratio of 2+).
If you currently have torrents there’s nothing stopping you from continuing to seed them if you don’t need the storage. Long term seeders are especially important for keeping torrents alive and you won’t need to redownload content you’ve watched just to seed it.
As long as you seed to 1.0 ratio (e.g. 1GB up, 1GB down) per torrent you don’t hurt the network. More means you compensate for someone not seeding.