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by SEMW 4673 days ago
> But then what if Google pulls the rug out from under apps that rely on it

As has been pointed out, it's open source (specifically, Apache 2.0)[1]. So, fork the code[2], if necessary find&replace any google trademarks, and republish as a dedicated authenticator for your own app. Or use one of the existing apps which have forked off gauthenticator, e.g. https://github.com/kaie/otp-authenticator-android .

[1] Except for some bits specific to gmail's 2-factor workflow added after v2.21

[2] git clone https://code.google.com/p/google-authenticator/