To understand why Richard Stallman doesn't actually care about UNIX and why GNU (GNU's Not UNIX) is not really about UNIX - look no further than his own comments:
https://stallman.org/stallman-computing.html
Quote:
|
I never used Unix (not even for a minute) until after I decided to develop a free replacement for it (the GNU system). I chose that design to follow because it was portable and seemed fairly clean. I was never a fan of Unix; I had some criticisms of it too. But it was ok overall as a model.
|
This is why he has not commented on systemd thus far - because it's got the "right" licence and that seems to be all that matters.