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I've talked with ZodTTD about this, but I've also done my own research into the licensing claims. What I've found is that most of his Cydia (and, presumably, Android) apps do rely on at least one GPL-licensed component. Note, however, that he can sell GPL'd apps, and the GPL specifically allows this: he just need to release the source code (edit: or give it to people when they ask).

However, looking at his GitHub, his source releases are not timely (although they do seem to be complete). If ZodTTD just added "dump source to GitHub" as part of his release process, there would be no issues here. I don't think ZodTTD is deliberately trying to steal money or code from anyone, but I think he misunderstands the importance of putting out the source code for his emulators right away, as they are released to a store.

(However, there is one exception: SNES9x has a license specifically forbidding commercial use. ZodTTD's "snes4iphone" then does, in fact, either need to be taken down or (at least?) made free from now on.)

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a) Accompany it with the complete corresponding machine-readable source code, which must be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or, b) Accompany it with a written offer, valid for at least three years, to give any third party, for a charge no more than your cost of physically performing source distribution, a complete machine-readable copy of the corresponding source code, to be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or,