> Well, actually, Google Cloud is just an abstraction on top of internal Google infra

I didn't say otherwise. Of course Google Cloud runs on internal Google infrastructure. They wouldn't have an entirely different stack to build Google Cloud on. The problem is that Googlers don't use Google Cloud.

Amazonians use AWS. https://courses.cs.washington.edu/courses/cse452/23wi/papers...

Microsofties use Azure. https://www.zdnet.com/article/microsoft-moves-closer-to-runn...

It is the right question. It's the right question because Google doesn't dogfood Google Cloud like they should/could. Dogfooding a bunch of stuff at a lower level of abstraction isn't the same thing.

Xoogler here. GCP was not an abstraction on Borg when I was there. GKE isn't either.

So up until late 2018 when I left, very little of Cloud ran on "proper" Google3 infra. This may have shifted slightly (cloud has been fishing for good Google infra to externalize a lot), but in general cloud!=google3 infra.

If anything important ran on Google Cloud, you can bet we'd see a blog post from Google Cloud marketing about that. Yes, many of the money losing side bets from the non-Google companies under the Alphabet umbrella use Google Cloud. That's only because they want the optionality to spin them off if by some miracle any of them are ever worth anything. If they were part of Google, they would use internal infrastructure. If they weren't under Alphabet, they would use AWS or Azure like everyone else.