Not an app developer, so genuinely curious: would offering only Google and Apple SSO (alongside email and password) be enough coverage for most users to reduce signup friction? Apps are rolling Apple auth out now as the deadline for implementation has passed.

My understanding is that to use Facebook as an auth mechanism, you must use their SDK (and personal data vacuuming along with it), so dropping Facebook auth would allow apps to drop the SDK, which would be a win for both privacy advocates and users who enjoy their apps working even when Facebook breaks something.