It really doesn't. Advertisers have committed budgets and have switching costs that are often much, much higher than those of end users. It would take a sustained, double-digit-percentage loss of users to impact Google's bottom line.

One user fucked over out of 1,000, even if they never return, is pretty easy to paper over. Which is why there's no phone number a user can call if they're in trouble. They don't really matter, so it's not worth the cost to address their issue.

AdWords advertisers, on the other hand, they can get a human on the phone whenever they want. Because if they have an issue, it's honest-to-god cash money that stops flowing into Google's coffers.

They're the real customers.