For example: https://www.google.com/.well-known/security.txt
I understand some scrappy startups like Google don't have the resources to have someone review security incident reports that come through a web form, but maybe they should if they want to be a legit cloud provider?
Googling "report google cloud security issue" does not turn up productive results. Compare to what you get when you google "report aws security issue."
https://bughunters.google.com/
Also, it doesn't shock me that somebody got a common group name early on in an internet-scale service's lifecycle. I've had a couple such experiences. Simple example: in the early days of Google Hangouts, you could choose your own meeting name in the URL. I chose "compass" for a meeting and accidentally landed in a meeting of Google engineers who were very surprised by my appearance. Fortunately my meeting was a meeting I had arranged so I beat feet and changed my URL to the default auto-generated URL before the rest of my participants arrived.
Or, actually have support, but that's not Google's style.