Do you know Anna's Archive already has a feature that lets you automatically download a subset of the torrents that fit under your available storage space and contain the most important (least preserved) data? How is your project different from that?
Levin uses that feature exactly! It is not unique in finding what torrents to seed; It's unique in that it dynamically uses the available diskspace (removing / adding data when needed / possible), and automatically turning off when not plugged-in / on wifi connection.
That makes sense, nice!
that feature has a "max terabytes" field. phones typically do not have terabytes of storage, and even if they did, people may not want to seed that much
It says "max terabytes", but nothing's stopping you from putting less than 1 there. If you want 10 gigabytes, you can just put 0.01 in there.