Android has about 2/3 worldwide market share and it hasn't had anything like this before. Many people, myself included, chose it exactly because it allows the installation of modded, pirated, or otherwise non-store-worthy apps.

There two main mobile OS in the space, one moron-proof but limited, the other a bit more permissive, but slightly less secure for it.

The problem is that most apps target only those two, and the second is trying to moron-proof, loosing most of it value to part of its users, while the apps are still locked in.