You ask for guarantees that an account will never be suspended, or that a service will never be discontinued.
I don't think that's even possible.
For one - abuse is a real thing.
Just ask Amazon about abuse and spam on their AWS platform. There is a reason that you can't just type in any credit card, and spin up 100 EC2 instances, or send 100,000 emails - depending on signals, Amazon seem to manually verify some accounts. But on top of that, they take proactive steps to suspend accounts acting in suspicious ways.
We do much the same.
It is a hard problem, and undoubtedly there are false positive and false negatives. That is regrettable - but I don't think allowing AWS or GCP to become a free haven for spammers or abusers is the answer.
You are correct that we need good procedures to deal with appeals of these things.
Regarding never deprecating a product - Google has started many products, and some of those have been shutdown. I know there's a lot of angst on HackerNews about Google Reader in particular - I myself used it a lot in fact. However, taking off my Google hat - of all companies, they are usually the best about letting you export your data, or migrate it away. When a product gets shutdown, you usually have 6 months, a year etc. to export your data. Even before I started there, they had Google Takeout which basically lets you export your data from any Google product in portable formats e.g. mbox, JSON files etc. Open standards are important to us - e.g. see our work on Kubernetes.
If there's a specific are you think we're failing on - please let me know, and I'll see if there's anything I am able to share, or if there's somebody I can link you up with.