I don't know what to think about the rushed inclusion of Copilot. It's so very very flawed.
The only thing I can think of is that users are training it by using it and therefore Microsoft is getting free labor from you (as well as search/advertising revenue through their lock screens, dynamic as based backgrounds, live tiles, etc).
Ever since Windows 10, Microsoft has been treating Windows as an "OS as a service," and their expected revenue source (at least from home users) is no longer license sales but whatever they can extract from users via subscriptions, ads, and selling their tracking data.