All of what you say is pretty accurate for free-tier Gmail/etc. No customer service, risk of an account getting blocked and nothing you can do, new apps not finding success and getting cancelled.
But none of it is the case with GCP. Customer service is great and you can reach real people easily, paid accounts aren't getting shut down without recourse unless you really are being abusive, and Google's not cancelling the services companies are paying for. (The same goes for the paid tier of Google Workspace.) It's a normal paid B2B relationship with all that usually entails.
It's unfortunate that people take their experiences and the stories they hear about the free consumer side, and extrapolate them to assume they're also true about the paid business side. It's understandable, but it's just not the case.
And neither GCP nor AWS is getting shut down. Even using the numbers you give, the answer is that the risk of either shutting down is zero for all intents and purposes. There's no reason to split hairs over which of two infinitesimally unlikely events is more likely, or use that as a justification for choosing one or the other.