With this terms of service, none. Which is why people don't trust them.
If I pay you for a service that would take time to migrate off of, and you are making money off me now, I am going to be ripshit if you decide to just turn it off because it's suddenly not making money for you in the short term. Google's done this a lot, and the fact that don't provide concrete time lines in their contract gives even less reason to trust them
It's not about the contract. AWS doesn't even have a deprecation policy in the contract - seriously, GCP provides more legally binding guarantees than AWS. It's about trust.
People look at AWS's track record, and trust that. People look at Google's track record, overlook what to an inside-the-company Googler perspective are dramatically significant organizational boundaries or product lifecycle definitions that are very poorly communicated outside the company, mentally apply reputational damage from one part of Google (or from a preview-stage GCP product) to a different part of the company (or to a generally available GCP product), and don't trust that.
Google has always been worse at externally facing PR than at the internal reality, even when I worked there (2011-2015). Major company weakness.
But the internal reality inside GCP, perceptions aside, is pretty good even now.
This is the subtle, but important, difference between SaaS and PaaS/IaaS. Services are to use. Platforms are built upon. Flickr is a service. If they shutdown I'll get another one. If they shutdown I'll just move to another. GCP is a platform, if they shutdown I have to re-architect the entire thing from scratch.
If it's costing them money they haven't figured out a model, yet, that works in their favour.
Customers won't pay money in the first place to use a service if it may vanish out from under them? I expect a cloud service provider not to offer a service unless they think it is going to be profitable, and I expect them to continue to offer it even if it turns out not to be profitable, because otherwise I will take my business to a cloud service provider that will give me that guarantee.
If I pay you for a service that would take time to migrate off of, and you are making money off me now, I am going to be ripshit if you decide to just turn it off because it's suddenly not making money for you in the short term. Google's done this a lot, and the fact that don't provide concrete time lines in their contract gives even less reason to trust them