I believe this is Google's rule that applies. Though, I think Beeper would be breaking it as well. Maybe I'm reading it wrong?
> Examples of common Device and Network Abuse violations:
> Apps that access or use a service or API in a manner that violates its terms of service.
I guess they don't really enforce it. Zenmoney reverse-engineered APIs of banking apps and their app is still on both app store and google play