Looking at this list, it makes you realize that basing your business on a lesser Google product is a major business risk. Consider Spatial OS.[1] This is a new back end for persistent massively multiplayer games. It's a product from a Google "partner", funded by $500M of VC money. It's only available if you use Google's "cloud". Technically, it's impressive. It's being used for a few minor game titles right now.
So if you're a major game developer, should you use this for a long-running game? The Google connection adds business risk. It probably won't be a major moneymaker for Google, and there's a good chance they'll drop the offering in two or three years. Then what? It comes with Google-type terms and conditions, the usual "Google can do anything they want". Drop the product, raise the price, cut off your service because you're doing something that competes with some Google interest, that kind of thing.
Spatial OS is not Google offering by any means. Google is simply huge investor in that company and those folks are using GCP as part of investment aggrement. It’s a dumb move by them but it pays their bills for now.
But you are correct. Taking dependency on Google services like maps, offers, product search and other APIs have previously bankrupted few folks. Also, as a user I avoid buying stuff like movies, music, storage space, photo storage etc because it could just disappear tomorrow.
So if you're a major game developer, should you use this for a long-running game? The Google connection adds business risk. It probably won't be a major moneymaker for Google, and there's a good chance they'll drop the offering in two or three years. Then what? It comes with Google-type terms and conditions, the usual "Google can do anything they want". Drop the product, raise the price, cut off your service because you're doing something that competes with some Google interest, that kind of thing.
[1] https://improbable.io/games