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Just use Aegis or andOTP
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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The question is moot. Just don't use it; there are plenty of better alternatives. I use https://github.com/jamie-mh/AuthenticatorPro and its been great
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There's an opensource version https://github.com/google/google-authenticator-android#installation
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.