I need general advice: I have an android app that currently relies heavily on GPLv3 source code. I have never published any app and I'm a bit rusty within android as my day job is programming in a different language.
If I want to publish it as a paid app I can either rewrite the functionality of the GPLv3 code or publish the modified source code - correct me if those are not the options I have.
Is it a bad idea to publish an open source app as a paid app? Could an original author of GPLv3 code license an essentially identical code to me for a fee? An/or is that a stupid thought? Should I just forget "cashing in" or is there another business model to consider? Anything else? Am I just looking at this "all wrong"?
NB: I don't like apps with adds. The model of having a perfectly usable app with an option for a little extra in a pro version (I have also bought pro versions of apps just as a way to donate).