Brave and Vivaldi (and edge) have no say in the matter, they are practically in the business of rebranding chrome for what it is and contributed to reinforcing goggle's monopoly. I have absolutely no sympathy for them.
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