An HOA (home owners associations) can say what color you can paint your house, What you can plant in your yard, What you can have in your driveway, and some even say what color your blinds can be.
Microsoft controls your computer, they say what info is sent back to Microsoft, and they say when you must upgrade. They can shut down your computer when they want whether you like it or not.
Thank you. That makes sense why some downstream distros designed for specific purposes (e.g. gaming) might include a handful of their own repos for specific software.