How Popular Is “Sign in with Apple”?
I tried to do a Sign in with Apple integration on Android (wanted the app to have the same options across platforms).<p>Testing on Android was next to impossible. To test I needed an Apple ID with 2FA.  But SMS 2FA was not good enough, you need the hardware-based 2FA.  To get that you need a recent macOS or iOS device.  As an Android developer I have no reason to own either of those.<p>Eventually I just had a friend who owns an iPhone try my app a few times.<p>Besides that, the Apple interface guidelines are nearly impossible to follow on Android because Apple doesn't provide the logo or font assets you need to comply.  There is no SDK whatsoever, just a spec.<p>Seems like a nice sign-in option for iPhone owners but it's a portability disaster.