I'm surprised that GCP is claimed to have less than the third of Azure's market share. And AWS is still comfortably in first place.

It also depends a lot on how they count these market shares. Once we go past the basic renting of CPU/Disk, it gets tricky: How far is a service still considered as part of the "cloud market". For example, renting a virtual machine to use as a desktop-in-the-cloud would count, but what about 'renting' a machine to play games? (Like with Xbox, Luna or Stadia) Same question with productivity/office services.