Explanation for newbies: The GNU/Linux copypasta is an argument made by Richard Stallman that the operating system should be referred to as “GNU/Linux” or “GNU+Linux” because linux is just the kernel and what makes it useful are the various GNU programs and libraries like coreutils and glibc.
Alpine Linux is a linux distribution that ships without any GNU software (though it can be installed using the package manager).
Isn’t the problem that it allows for it though? So big company could take Alpine and fuck over users with it in a way that users can’t modify. But GPLv3 would require it to be open so that users are always free to change it.