They can't force the entire world to use Windows, its a national security risk for countries other than USA.

Each country would need a locally maintained OS they can force on people

They are effectively forcing official Android on all smartphones in most countries with digital ID apps using Play Integrity. More and more people are using smartphones as their main computation device now.

Well that is true sadly but desktops and servers are still a different subject

For now. They have a legacy of openness that will take a while to squash for sure. But they're experts at this kinda maneuver.

A lot of Linux distros work fine with secure boot

They all works fine because Microsoft allows distros to sign their keys. We are a single bad law or a change of corporate politics away from them not doing that and deleting Linux out of existence on personal computers.

Now, maybe you’ll still be allowed to if you have a special license from the government to purchase approved hardware to run it in a datacenter. Which can be promptly revoked if you were found to be running illegal VPN software or something like that.

You can self-sign keys. Secure Boot has had a mechanism for that already for years (mok on Linux).