I did a little test (Virtualbox) to see what the Arium project was like. It is a version of Windows 11 (redesigned interface), without user account, without license but retaining certain aspects of the official version (security, Store). You can install browsers and other free software offered by the developer.
Here is the link (in French...sorry) : https://www.ykn.fr/pages/arium/
Not sure that this project will hold up...