The point there is that most of the underlying user space plumbing of modern Linux system is in fact funded by Red Hat in one way or another.
(And in this context it is probably useful to realize that on the kernel side of things the amount of funding from Red Hat and IBM is comparable)
The same should happen with the init system. Of course, it's different when the software pretends not just to be an init system but also a replacement for tons of other daemons like cron, inetd, networking, etc, making it a huge piece of software. But maybe that's the problem in the first place.