This isn't correct. They use global numbers not UK numbers.
> In relation to cloud gaming services, we found that Microsoft already has a
strong position. It owns a popular gaming platform (Xbox and a large portfolio
of games), the leading PC operating system (Windows), and a global cloud
computing infrastructure (Azure and Xbox Cloud Gaming), giving it important
advantages in running a cloud gaming service. With an estimated 60-70%
market share in global cloud gaming services, it is already much stronger than
its rivals.
This information is incorrect though. It suggests that everyone subscribing to Xbox Game Pass Ultimate is doing so for cloud gaming, which is obviously nuts.
If you read the report then the CMA comes across terribly. They don't understand basic technical facts. Apparently a competitor to Microsoft told the CMA that they solved latency issues with cloud gaming by increasing GPU power. Someone should alert the nobel prize committee about conquering the speed of light.
They make other bizarre claims like apparently everyone that subscribes to xbox game pass does so for cloud gaming. Cloud gaming isn't even offered in most markets. There is no way people are subscribing to game pass for cloud gaming, its not even good.
Its obvious to anyone with a brain that peer-to-peer is the way forward with game streaming because it solves the latency problems.