As a fulltime web dev, I had a guess of who's cloud that was, but had to look the name up.

They may have numbers due to Chinese usage, but no Western company is going to use Chinese hosting, ever.

Gartner isn't a source that I'd use as a basis for it (or honestly, anything). I would take a look at annual revenue for all of these businesses.

Gartner ranks companies by how much they pay Gartner for "advisors"