There is another side of this, which is workforce training and capabilities. As much as AWS / Azure / GCP are alike, their services and behaviors are very diff

There is another side of this, which is workforce training and capabilities. As much as AWS / Azure / GCP are alike, their services and behaviors are very different at a detailed level of overview, requiring separate tooling and best practices. I could see someone wanting to procure a specific cloud vendor as their toolsets already support this.