This has happened to me a couple of times. Once, my account was locked for a day because their system flagged one of my servers for suspicious traffic. They locked all my servers, databases, and everything else, not just that one server. Another time, they locked a different project for a week. It actually took me a week to find a human who could unlock it; otherwise, it could have been even longer. I still don't know the reason for the lock.
So the main problem is that Google don't care about GCP at all, and threat paid customers in same way as free users (i.e., hostile to both)