I believe Qt does offer a shared library for Qt that can be shared/upgraded across multiple apps. I wonder if that's enough to allow one to deploy on Android (iOS is obviously a no-go).

I have an early prototype in Qt that's not going to be a big bread winner, but it'd be nice to be able to release it and get some feedback (even if that means that they have to install the shared Qt package too). I'd probably just bail on the idea if I had to pay much of anything, especially monthly.