I use GCP and the support I've gotten with a silver plan (their lowest) has been surprisingly good. Low priority stuff like bug reports have been forwarded to developers and occasionally fixed.

High priority tickets I've seen a very good response time on (far better than the minimum guaranteed), though I am going to upgrade to the next level plan to get better response times on the weekend.

I have not used AWS support so I can't compare, but GCP support has been pretty good in my experience.

Merely being a customer is not enough though, without a paid support plan you're basically on your own. This might be standard for cloud providers though from what I can tell.