Do you think that Google would intentionally violate their contracts with various huge companies (Broadcom, BBVA, Colgate-Palmolive, etc) gain a little bit more advertising revenue? If nothing else the personal lawsuits for securities fraud against executives would be a huge deterrent.
I strongly doubt that they would, but it should be noted that them doing so would be extremely difficult to prove, and even harder to identify in the first place.
I see no reason why Google would treat various huge companies the same as my one person setup even if we all nominally use the same product (and anyway I'm pretty sure Broadcom et al. haven't signed up using the same web interface I would use).
Google, Amazon, Microsoft and all the other major SaaS providers certainly have strict controls to prevent misuse of customer data. Pretty much all companies end up signing up for products the same way, at least with the companies I've worked for.
