> Do I really need to pull out all of the exemples of Google support being the absolute worst on Earth?

For paid products, denying or lying about there being any issue as serious as significant data loss for over a year like Bunny did, yes.

> Microsoft arbitrarily banning IPs/AS from its infrastructure with no recourse or acknowledgement of the issue (such as 365 lying about accepted mail traffic through SMTP)?

That sounds closer but still not comparable.

FWIW I had Gmail lying exactly the same - back then I had a Googler actually check the logs and confirm.

I've got a 250 and the ID, then the server discarded the email.