

which is supposed to enforce to run apps in secured phones
The point of the Google Play Integrity API is to ensure that the user is not in control of their phone, but that one of a small number of megacorps are in control.
Can the user pull their data out of apps? Not acceptable. Can the user access the app file itself? Not acceptable. Can the user modify apps? Not acceptable.
Basically it ensures that the user has no control over their own computing.
They want to make money off of services, every service they offer requires a Microsoft account to purchase and use. Everyone that they force to make an account during setup is one step closer to paying for a Microsoft service.
There are obviously tradeoffs (less sales of these versions of windows and some users pushed away from Windows altogether among others), but the motivation is clear.