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.
I am willing to bet there would be zero explanations along those lines.