I just meant "serious" in the general sense of the word, like the way that a bullet would in the stomach is serious, even though one in the head is more serious.
> Google's core functionality is redirecting users to third party websites
I'm pretty sure that Google's core functionality is ads, which don't require the user to actually be actually visiting pages Google.
Pertaining using Google for social auth, the user is actually expecting to go back to the site they just came from, whereas when they login to update their credit card they're logging in to stay on Google, which means that a page that looks exactly like Google...
How long this functionality remains on the site will be a better indicator. My guess is not long, esp after the publicity.