Patent trolling issues aside (they're valid, but discussed and I'm just another one of the "software patents suck guys"), I'm surprised that Google doesn't provide protection for developers using the Play Store. It's a very critical service for developers writing code for Android -- though it's not
always required it is if you want your app to be seen.
They certainly don't have to and I'm not sure if Apple or Microsoft do or not for their equivalents, but I know Microsoft offers patent indemnification for a lot of things these days. It would be in Google's best interest to have a patent indemnification policy for Google Play store.
I'd love to know what the actual numbers look like but I'd be willing to bet that the costs are extremely low since it works as a deterrent to these kinds of lawsuits. Patent trolls go after these lone developers because they'll settle rather than incur the cost. It's an easy buck. This guy didn't make Google Play, he didn't write the code that "supposedly" infringed on the patent. He simply used it because that's the only way for practical purposes to publish an Android app. And since the patent covers a large set of features that Play uses for licensing, he couldn't have published through Play and not infringed in the eyes of Uniloc. The law allows anyone in the chain (including the guy playing with the Flight Simulator) to be sued for infringement, but they'd be very unlikely to do this kind of garbage if they knew Google would bring their legal team into the fold. By not protecting their developers, Google has a deterrent to people using their platform.