At least Brave forks Chromium and they have a bunch of patches they apply to the codebase. I mean yeah, they still contribute to the Chromium monopoly but calling them just a rebrand is a bit unfair in my opinion
Closest I could find is this mug and of course it’s on Etsy.
Useradd is the basic unix one, so that should work regardless of distro. Adduser does some special Debian stuff iirc