More fees.

Never underestimate greed is something I learned in my 46 years alive.

Long term, there is some benefit to this sort of concept. You aren't going to have as much freedom to turn your cloud based OS into a custom build, but what you will have is a machine which will never have down time for patches and security updates. The user will be running their app remotely, using all the power and hardware of a data center, and the instance of the app can migrate from one host PC to another, seamlessly without any perception to the end user. Furthermore a user can access all their applications and data from whatever client they are using and it will migrate this session from their terminal, to their phone, to their AR HMDs.

It isn't going to be a change which happens over night, and it will be more like how car engine have become less user serviceable but more reliable and efficient. It will be a different experience for sure, but it has potential value beyond being a way to charge people subscriptions.