If only they had some process where a customer could agree to have Google publicly explain why an account was banned, I think we'd see many more explanations along the lines of "This customer was using Google cloud to launch Ddos attacks" or "This customer sent bomb threats to the president".
Considering these links are all about people with valid businesses and apps, I doubt your examples apply for violations.
The only thing that's preventing Google from telling their side of the story is their own refusal to engage human-to-human with individual customers.
Which law?
> That's still your private mail. They can't go looking it it,
They definitely subject it to all kinds of automated scanning for spam and potentially abuse. The nearest thing to a public statement from Google on the subject seems to be: “very specific cases where you ask us to and give consent, or where we need to for security purposes, such as investigating a bug or abuse”
i.e. there may be abuse cases where they read your mail without asking.
I am willing to bet there would be zero explanations along those lines.