Who would trust Google to build expensive products on their platform? I wouldn't be surprised if the prices change dramatically or they decide to discontinue the service. Worst decision you can make is to invest in cloud proprietary APIs/services(i.e Google Datastore/Firestore). You can put Google next to Facebook(with Parse or whatever "cloud" service they've been offering)
The part about prices is true to any cloud provider. Amazon increased our prices by 170% over the years, same usage. I was not surprised when I saw big shots falling back to self hosting (like Dropbox from Amazon to own hardware).
Google Fusion Tables [0] is B2B, its over 10 years old and it will be killed this December. Fabric is also B2B and 4 years old and will be killed in a couple of months. Source: https://killedbygoogle.com/
[0] Google Fusion Tables was a web service for data management that provided a means for visualizing data in different charts, maps, and graphs.
[1] Fabric was a platform that helped mobile teams build better apps, understand their users, and grow their business
