They don't except for certain products. Google Cloud has a paid support plan. The free tier only lets you file tickets for billing issues. I ended up just filing this ticket as a billing ticket even though it's really not
Yeah I had similar experiences with GCP support a couple of years ago when I discovered that killing a k8s cluster takes hours. My issue was technically related to billing since I was getting billed for GPU VMs the whole time, but their free support was completely useless. They probably exist only to meet some checkbox requirement for accepting credit card payments