A rotating schema of pirated API keys seems even less sustainable than just risking use of a proprietary API. Not something on which I'd want to build a business either. At some point, the effort of reverse engineering exceeds that of actually building the damn thing for yourself.
The reverse engineering can be automated (as the official apps have to use the key at some point), and as the official app won’t get cut off from support, you can just continue using the latest version of it.
