I can believe it, because of how integrated everything is at Apple. You probably need to bring a lot of iCloud support over (App Store, backups, apis), but that may also require supporting applications and configurations

It’s based on a specific piece of hardware in the iPhone called the Secure Enclave that basically keeps all of your PHI in a place that nobody but you can get it. It doesn’t transfer when you get a new phone, for instance, and has to be recreated. I’m betting that an Android app involved some sort of emulator, performance was awful, and they gave up.