No idea how many of these have 3 users and how many have 30000, but wow, that is a number of Arch derivatives:

Alfheim Linux
ALOBE
Antergos
ArchBox
ArchEX
ArchLabs
Arch Linux 32
Arch Linux ARM
ArchStrike
Arch XFerience
Artix Linux
Astian OS
Audiophile Linux
BBQLinux
BlackArch Linux
Bluestar Linux
Chakra
Condres OS
Ctlos Linux
DidJiX
Hyperbola
KaOS
LinHES
MagpieOS
Manjaro Linux
MorpheusArch
MSYS2
Namib
Netrunner Rolling
Ninja OS
Obarun
PacBSD
Parabola
PuppyRus-A
RaspArch
Revenge OS
Sonar
TalkingArch
TeLiSc OS
UBOS
Velt OS

https://wiki.archlinux.org/index.php/Arch-based_distributions

Which ones use an alternative to #systemd? I think Artix does and Parabola optionally can?