There is only one customer at Google, and it is the people buying ads.
Astonishingly enough, even at moderate ad volumes there's still no customer service. You have to start spending truly astronomical amounts of money before an actual rep will attempt to help you with essentially any problem.
So to Google, "actual customer" means "someone spending six figures per month on advertising on our platform". As far as I am aware, even similar spending on other areas (GCP) doesn't warrant "actual customer" status.