I know some of you have gone complies FOSS, but I believe if the developer wants to make money from their apps, there's noting wrong with it, as long as they are ethical. So what are your favorite non-foss apps?
I think you've got a bit of a misconception about FOSS software - you're allowed to make money selling it, you just also have to provide the source code to any customers! A fair few FOSS apps have free versions on F-Droid but paid versions on the Play store, for example.
I have the F-Driid version on my phone. I don't know all the differences with the play store version, but one difference is that you can't in-app purchase the premium features.