Yes also BSD and friends.

From TFA

> These amendments redefine the term “operating system provider” to exclude any person or entity that distributes an OS or application “under license terms that permit a recipient to copy, redistribute, and modify the software.” Any software distributed under the GPL, MIT, BSD, and Apache licenses satisfies that test, which removes the likes of Debian, Fedora, Ubuntu, Arch, and the BSD family from AB 1856’s scope.

According to the article: "it's any OS or application “under license terms that permit a recipient to copy, redistribute, and modify the software.”"

The article then explicitly cite "Debian, Fedora, Ubuntu, Arch, and the BSD family".

There is also another exclusion for libraries and software from a packages managers like apt and pacman.

So from my understanding ReactOS, hobby OS but also CP/M, FreeDOS, Haiku or Collapse OS...

They include the majority of OSI licenses, including BSD. So the majority of BSD variants are included.

Anything that’s open source