So what? I'm not responsible for other people's business models.
It's funny, because I remember computing in the 80s and 90s, when most software came in a box and was bought from a store or through mail order. Piracy was a problem then, and companies tried to invent all sorts of copy-protection schemes. Some of them worked decently well, but most (all?) were eventually defeated. That didn't stop the world from having a healthy market for software.
Phones are no different. If Android developers have a piracy problem, they should develop strong copy-protection schemes. Sure, none of those schemes will be perfect, but they generally have the effect of moving piracy further out to the margins.
Otherwise: tough shit. If people pirate your app, explore avenues through the legal system to get them to stop. If that doesn't work, that's just a cost of doing business.