They are testing it, every time someone signs up and it fails. We don't know that this wasn't something that changed on Google's side, so IMO it's a bigger indictment that no one is monitoring their live email deliverability
Maybe the whole thing was intentional, right at the footer of viva "Cloud services by Microsoft Azure" ; #1 I've never heard of viva before #2 I've never seen an azure logo at the footer of a website.
If I were to test an email delivery system, I would test Gmail. I probably wouldn't test Google Workspaces, because I'd (wrongly) assume that they work the same.
No, just over 6 million paying business customers.
But hey, if you're in a business domain where categorically leaving 6 million potential clients-who-are-demonstrated-to-spend-on-things isn't an issue? One fewer thing to worry about, right? ;)