Hi all, I'm the author of this port and I'll answer some questions (even if they haven't been asked =)
First of all, I've never sold my ports of GPL software because, as all we know, selling GPL software is not only amoral, but it is obviously senseless also (although, tech support for GPL software can be sold).
Some people have tried to sell my ports without any modifications and finally that content was removed: I know how to defend my apps even it the case of GPL, I've simply packaged my own MSPaint-drawn pictures in APK and any usage of them IS violation because these pictures are not GPL (because APK package is NOT a derivative work, it is just a ZIP archive, only classes.dex and native libraries are).
BUT I don't like GPL and I will not follow it before publishing app on Google Play. Well, you can try to sue me but these ports are initially published on the websites where you can find a lot of real pirated apps, so nobody cares.
The reason why I don't like GPL is that anyone can just sell my work as his own what is probably amoral. You can find a "Quake Touch" port in Google Play, he have banned the whole Russia to block my source code requests

(but he doesn't seem to use any code from QI4A, if he will, I'll just republish his app for free). This "Quake Touch" port is in a trademark violation also, "All trademarks are used under the terms of Fair Use" is a lie, because the only Fair Use of trademarks in commercial products is a nominative usage (to REFER original product).
And I don't use shareware datas, because I've read a license agreement.