If you trust Gartner's judgement, the only major players are AWS, GCP, Azure, Alibaba Cloud, Oracle Cloud and IBM Cloud. Can read their definition of "innovative" in the Magic Quadrant report at https://www.gartner.com/doc/reprints?id=1-50WJ5CK&ct=180525&...

As you can see, all the players with a global reach are pretty dominant in some industry or another: database software, Chinese e-commerce, and general computing. If you don't need the global reach, though, you get more options.