Interesting! I’ve mostly seen it written as systemD. I wonder why that seems to be so popular…

Many of the more juvenile systemd haters used to deliberately spell it that way.

As an insult, it was rather less successful than the "Micro$oft" / "Slowaris" / "HP-SUX" mockery from the 1990s - but it did manage to sow enough confusion that that it still pops up regularly today, even in contexts that are otherwise neutral or positive about it.

	▲	bee_rider 7 days ago \| parent [-]
		That’s funny, I’m not even sure what the D is supposed to expand to, in that insult. What a silly and lame thing to use as an insult. I’ve been using it because having some random letter capitalized seems to be the totally unsurprising for this sort of plumbing software. (And by plumbing, I mean: very useful and helpful boring stuff that deals with messy problems that I’m happy not to care about, just to be clear that I mean it positively, haha).