Being a paying customer of Google is not as big of an improvement as you think.
I work for a small company with under 1000 GSuite Enterprise licensed accounts. One of these accounts was suspended without warning a few months ago. Google support, when contacted, said the suspension is the warning, since the account could still be reactivated.
This was one of our main customer service mailboxes, which handles sending and receiving hundreds of customer inquiries daily.
Google support also claimed that it was due to a high number of messages from the account reported as spam. There is no built in admin tool (or API) for viewing how many messages are reported as spam, but they did offer access to an additional reporting tool. We set this up hoping to see the actual number of spam reports so we could monitor. The reports showed the count of reported spam from that email address over the previous 6 months was zero.
We still have no idea why the account was suspended.