Arch Linux doesn't contain ed in their base package group.

Debian doesn't install ed by default, although it did in the past: https://bugs.debian.org/416585

Arch and Debian and Alpine Linux, to my knowledge.

Which is sad because technically POSIX wants ed installed so purely technically, those distros aren't fully POSIX compliant.

My install of Gentoo Linux doesn't have ed.

It is available in the packages, of course.

my arch/ubuntu/debian/rh hosts don't have it pre installed. It's installed by default in an aLinux instance though.