SSO for the whole internet would be sweet. I don't care at this point if it's run by one company - federated login systems have failed to work for two decades, it's time to give up.
Btw luckily what reported doesn't work for me, the site ask to login. It should not be even possibile, at least without exploting a bug/vulnerability.
> It should not be even possibile, at least without exploting a bug/vulnerability.
This is actually very much possible. I just learned that it's implemented using Google One Tap for Web. [1] That's the web version of One Tap, which lets Android app developers add single-click login using a Google account.
Apparently one of the features of the SDK is automatic sign-in [2], without any user interaction, which Quora seems to be using. In contrast, LinkedIn and Medium also use the same SDK but only suggest logging in with Google in a pop-up. [3]
Edit:
There's a way to turn it off. Disable "Google Account sign-in prompts" setting in Google account permissions [4].
[1]: https://developers.google.com/identity/one-tap/web
[2]: https://developers.google.com/identity/one-tap/web/guides/au...