[toyg]

It's well-known that the real money in apps is in iOS, which dominates the top-end of the market. The AppStore makes much more profit than the Play Store despite being on 1 device for every 4 Android ones. In that situation, if you have no access to the most lucrative audience, it makes sense not to invest into apps at all.

It's also not trivial to install Android apps outside the Play Store, for non-geeks.

[scarface74]

We are talking about porn. Do you know the lengths that people will go to see it? That would be a killer app. Heck Pornhub could sell a custom Android device just for that one killer product. Anyone who has a modicum of capital can get a run of customized AOSP based devices to resell.