@yomiel @menherahair @phnt @Cyrillic @SuperDicq >I have yet to encounter this wrongful tagging of software in Gentoo, by the way. I'm sure it exists but it's probably rare.
Then you haven't looked - a large percentage of packages have the wrong license and all the Linux ebuild's should have LICENSE="GPL-2 no-source-code", but they are LICENSE="GPL-2"

>Mixing non-free and free packages in a repo would normally be wrong, but Gentoo doesn't work that way.
Gentoo does mix nonfree and free packages in the official repo - as a result, running `emerge --search` can return results of proprietary packages.

>You can add ebuilds but not repo's.
You can quite easily add ebuild repositories via /etc/portage/repos.conf

>therefore (with the exception of wrongfully tagged packages) you can't accidentally install the wrong software.
As there are many wrongly marked licenses and there is proprietary software in the official repo, you can accidentally install proprietary software.

>Not once does Gentoo ever encourage installation of non-free software.
Gentoo encourages installation of proprietary software in many places, including the wiki.

>If you think Guix is okay despite the non-free nonguix repo
Guix by default at least doesn't have that repo enabled, meaning you cannot accidentally install proprietary software.