Also, unlike many Drive apps, where I have to share my information with a third party provider, or "trust" the app, Sandstorm doesn't let my apps betray me. Privacy is inherent in the design.
But the key thing, is if I don't like my host, I CAN LEAVE. I am at the point that I loathe storing my data with Google. I love Gmail, and I wish I could take it with me and put it on a server run by a company I trust. But I can't do that. With Sandstorm, I can. I can run the app I want on the host I want. I have control of my app, my experience, and my data.
Google ruins my experience on a weekly basis. They change things without my permission that breaks my workflow and makes it hard for me to go about my day. I KNOW my Sandstorm hosting will do what I want it to do.
Google can't do any of this for me.
No other company has that kind of volume of data and heuristics
The big issue, is your much talked about data and heuristics are unreliable. Since Google changes their software or algorithms without my permission, I can't rely on any of them.