The whole app store / microtransaction mentality has been a poison for open source developers, and it’s brought out a bunch of unscrupulous swindlers who are happy to repackage other people’s work and charge for it.
It’s a shitty situation and, in the end, everyone is getting screwed. Devs figure “if it’s going to get ripped off and sold anyway, I may as well be the one getting paid,” which makes sense, but is pretty cynical all the same.