Oh, courts routinely give binding weight to words like Google's deprecation policy uses, and any large megacorp who is sufficiently badly impacted by a legalese violation (though SLA issues and deprecation issues are two separate things) wouldn't be scared away from a lawsuit by Google being big. I can imagine EU regulatory action or a class action lawsuit as other possible mechanisms.
But as I say in another comment, the contract is less important than both trust and reality. Keep in mind nobody focuses on how AWS doesn't even have a public deprecation policy.
I'm right there with many people in this thread in agreeing that Google has a trust problem, due mostly to real perception issues stemming from Google's habits outside GCP, which can and do impact people's perceptions of what they'll do with GCP.
The reality of what Google has done and will do with GCP, though, is pretty good. Sure they do sometimes deprecate things in ways Amazon never would. But not nearly as often or as abruptly as they do on the consumer side - that would be commercial suicide - and they do other things better than Amazon. Tradeoffs.
