It's not modular and when other packages assume it's there it starts to become difficult to remove it. So where's the choice in that? This is just Linux becoming a corporate thing - going in whatever direction the big players want. When money is involved it seems to generate some quite dismissive attitudes.
On the good side, there are non commercial distros already with more than acceptable alternatives and I am using one of them now (with dinit - very nice). I'm not suffering. I have a distro that is far less complicated than Fedora and vastly easier to fit to my needs...and actually faster too. I hope we can avoid Linux becoming Windows or the Mac. Desktop domination is a silly goal - if it happened it would only result in a similarly locked down and unsatisfactory system without choice.
I think the main reason that there isn't a systemd fork is that it's just not particularly worth it: it works well enough for enough people that no-one is motivated enough to try to improve on it outside what the project is doing anyway. And those that do strongly object to it tend to reject the whole approach and so they start from scratch, and then lack traction because they don't interoperate at all.