Supporting mainstream OEM variants can already be enough of a nightmare in behavioural differences. What motivation do most companies have to support Graphene, which will be a handful of customers at best? Developers may be fine with offering a best effort support model, but legal certainly wouldn't.

The funny thing is, nothing needs to be done to support GOS. GOS has 99% android app compatibility. The issue isnt that GOS requires changes in the app to support it, rather, the tools they are using explicitly ban non-certified OSs.

Dont let their boilerplate responses fool you, tools like play integrity only serve to push anticompetitive practices. The claims about not being able to support GOS are nonsense, and all they did was break existing support.