The point is, that anyone who tries to make money by ad-bombing the app and adding it to the playstore will be punished. If you post your virus-infected fork in the far-behind edge of internet-nowhere Louis would not care about that. Otherwise: why do you not ask him yourself if you want to post your own fork and under which conditions that should be possible. If you ride principles, then develop your own app that is much much better and FOSS than grayjay. Nobody stops you.