Thanks, and right... I don't expect maliciousness on fly's part. But you'd be surprised (or not) how many goog products phone home with anything they can find. In fact it might be called a "business model" of some sort.
Google's SSO can't really phone home. You're either using SAML or OAuth; in either scenario, the information flow is Google --> the app you're SSOing into; name, email, and user group information.
If you're SSOing into, say, AWS, Google doesn't get any access or private info out of AWS in the flow.
Accidentally hit enter the moment before HN went down and didn't get to edit it. :-D
But yes, reading google on your network gave me the heeby-jeebies. That the 'normal' thing is to host them on google is not really pertinent. If I was interested in that, I'd have done it. But I'm looking at other parties on purpose.
ceejayoz seems to think it is not technically an issue, google is not on your network. That sounds plausible to me, assuming it is accurate.
I realize this is for employees and it is hard to escape their gravitational pull, but I hope no customer data is going to Google unless asked for.