The point is that they have no financial incentive to clean up or prevent bloat, so they don’t.
Linux doesn’t either, but the Linux community operates on principles and passion instead of financial incentives, and so thusly is not similarly bloated.
The goal of msft isn’t to be and efficient steward of your resources, or better enable the user, or to create a platform for game/app developers in hopes of creating a more attractive ecosystem for you.
It’s nothing like any of those things.
The goal of Microsoft is to maximize shareholder returns, and the best way to do that is to abuse their dominant market position while monetizing every aspect of their platform that most people will buy anyway.