Can't say for GCP and Azure. But I run two small projects on AWS, with monthly billings of $8k and $150 respectively. I have always received very good support to any requests that I have made on both projects.
The last time I needed support from Google, I had found a bug in a service. The dude acknowledged it, got a request submitted to fix and provided me a with a coded workaround customized to my scenario.
Spooky23|24 days ago