You are allowed to charge for most libre-licensed software, but of course in practice if it's popular enough somebody else will just build it and undercut you.
I do wish there were more institutions funding FOSS work though it can be hard to measure the benefits and progress for individual projects.
Looks like there are already interesting projects coming out of the de-compile like an unofficial android launcher:
https://github.com/Ekyso/StS2-Launcher