Snaps can be 'strictly confined' which means all their reading and writing happens in a limited set of directories exclusively for their use. So 'snap remove' c

Snaps can be 'strictly confined' which means all their reading and writing happens in a limited set of directories exclusively for their use. So 'snap remove' cleans everything up perfectly. Ask your upstream for a strictly confined snap, it's a bit more work but once they have done it everybody wins.