Ubuntu is moving towards a closed environment with their snaps (when using apt install firefox, it installs a snap. That is just plain wrong). But they are doing other weird things as well.

RedHat, well: IBM. They mangled the whole Centos thing right before eol of the old one and the intro of a new version. Currently, when you legally decide to share the source code of Redhat, you are allowed to do that (according to the GPL) but Redhat will cancel your subscription after you do that,

So, yes, technically you are allowed to share the source code, but they will kick you out of the building.

All in all, Debian is the only one left for serious consideration in my servers / desktops.

Hell yeah, debian stable on my servers and testing on my laptop. #perfection