@aral the shit part is that if they don't do it, lots of people won't buy their product.
In my country (idk how it is elsewhere), banking or government apps literally will not work unless you have them installed through the app store (which ok you can spoof if you know what you're doing but same argument as changing OS applies) and/or unless you have Google Play Services. It's a huge issue for google-free custom OS users too.
It's a damned if they do, damned if they don't type situation