Snap can't seem to access my mounts. They're not very special mounts, but it happens in linux that you mount something, but snap just won't access. That made "no-go" a no-brainer.
The limitation stems from a design problem, details at https://bugs.launchpad.net/ubuntu/+source/snapd/+bug/1643706.
At this point snap sounds like a bad joke to me. Especially when Flatpak already exists.
https://bugs.launchpad.net/ubuntu/+source/snapd/+bug/1662552