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Google is the poster boy for "fuck you we don't support this any more"

Also, you're then forcing users to sign up for an account with the provider you choose. Some people choose not to have a Google/etc account.

Doubt it will happen with authenticator since many of their other services would be dependent on it unlike some of the services they have shut down?

Honestly I wouldn't rely on their own internal services using it being a great reason they'll keep it going.

Deviating from Open Standards in favour of their own google-specific services is pretty much step one in their playbook now.