What use would one have for using a robot to quickly and automatically solve a challenge that’s supposed to tell you are human and not a robot yet takes a human longer than a robot?
buster is a technically legal software designed to show how easy it is to bypass google recaptcha.... if this continues to work, why not a third party SAAS that allows the same thing via an api?
Maybe OP was just having a look, out of curiosity.
But I agree on your last sentence, like when a porn site invites you to sign in with your Google account. That feels like a way to get compromised somehow.