[CamouflagedKiwi]

I agree with the general point - there are a bunch of things I don't like about Docker much. (Podman inherits the same issues but it is just copying the interface). Definitely agree on the licensing thing. It's quite a trap if you have some copyleft surprise and they could do more - like just require an SPDX identifier on each repository / image.

I've used systemd-nspawn before. I didn't find it notably simpler and did find lots of weird edge cases where things didn't work (most recently something between ~249 and ~253 giving 'permission denied' errors on mounting /proc into new sub-namespaces within it, boy was that not a fun or easy time to try to work out). Maybe that makes their final point a fair one, that VMs avoid a lot of this without so many awkward subtleties.