if you live/sell in a country that respects software copyright/license, then you can sue them or get a cease and desist for using it against your license (say prohibiting commercial derivative or violating your copyright without authorization)
and your software, if popular or lucrative, its going to get ripped off anyways like in the real app store (just look at the many clones of many apps), or just plain pirated like the myriad apps (photoshop, word et all) have since basically forever
am i way off-base?