If I read it correctly there are about 250 million active sites (roughly). It seems unlikely that they are all massive corporate sites.

As an aside, the idea that systemd is a good thing is hilarious to me at the least because it is so brash about making an important change to a huge chunk of the system. Yes the bugs will eventually get ironed out, but in the meantime? Count me out! I have work to do and am not interested in being a free tester for Redhat on my live systems.