I just cant wrap my head around why they're willing to go so far to gain good will from people by having such a generous free tier, but somehow licensing the code under a FOSS license is out of the question??
Why not just go all the way and make sure everyone who cares about reading the souce could also give you free contributions?
Unfortunately, from trying this myself, I don't think you can forward port 53 to the Android host, so that won't work (easily). It seems that privileged ports aren't allowed to be forwarded.