In my experience, everyone got their act together except Google. I also used to receive massive amounts of spam from Azure and Sendgrid but this eventually stopped. Now 80% of the spam I receive is from the Google network, mainly Google Cloud.
> In my experience, everyone got their act together except Google.
I remember a bunch of spam and fishing emails from weird Outlook addresses. Don't remember any from Google.
Why do you interpret that as everyone except Google getting their act together?
The obvious (and correct) explanation is deliverability. Spammers send from Google services because they can inbox, they don’t send from other services because those services will not inbox successfully.