GCP is a SPoF. If you care about your availability, avoid single points of failure. Then it doesn't matter if what support tells you turns out to be not true.
How you do that can vary, but ... billing issues are always a risk. Having two cards, with two different banks, and two different names, is a pretty basic precaution to take. Having multiple cloud providers closes out a bunch more existential risks.
DNS is the one unavoidable SPoF for most Internet businesses: you cannot have a "backup registrar". The best you can do here is pay for a quality service provider: someone who will call you if there's a problem, before they cut you off. That's going to cost a lot more than GoDaddy, btw.
How you do that can vary, but ... billing issues are always a risk. Having two cards, with two different banks, and two different names, is a pretty basic precaution to take. Having multiple cloud providers closes out a bunch more existential risks.
DNS is the one unavoidable SPoF for most Internet businesses: you cannot have a "backup registrar". The best you can do here is pay for a quality service provider: someone who will call you if there's a problem, before they cut you off. That's going to cost a lot more than GoDaddy, btw.