Google doesn't use data stored in GCP for their own purposes any more than Amazon uses data in AWS or Microsoft uses data in Azure. That said, it's completely

Google doesn't use data stored in GCP for their own purposes any more than Amazon uses data in AWS or Microsoft uses data in Azure. That said, it's completely understandable that companies don't want to help fund competitors. --Walmart knows that they could use AWS without having any real fear of Amazon employees looking at their data to get a competitive advantage, but they chose Azure because Microsoft is not a direct competitor. Likewise, companies providing healthcare software look at what Google is doing in that space and they don't want to fund the competition by using GCP. These are rational decisions that we would expect companies to make. It's actually more surprising that, for example, Netflix still uses AWS given the fact that Amazon is a direct competitor in the streaming business. --GCP or Azure would make more sense here unless Amazon is giving them a really good deal to keep their business.