(Serious question) Isn't it risky to rely on any Google product as a foundation for your business? They've shut down more popular services that people depend on than Google Cloud. They tend to enter a market, undercut all the competitors, and then once they are dominant in the niche they terminate or change the service in a way that makes it not fulfill the original promise.
Jokes aside, probably you are thinking about free products like Google Reader, because this:
> once they are dominant in the niche they terminate or change the service
would not make any sense if the product in question makes $$$