Amazon is 5X Bigger Than All Other Cloud Vendors Combined

AWS is simply dominant, at the moment, in cloud computing, you might conclude from a Gartner analysis that shows Amazon's AWS is five times bigger, in terms of the utilized compute capacity, of the other 14 cloud providers Gartner looked at. 

Telcos and telco-related entities probably still will be found most often in the infrastructure as a service part of the business.