@Suiseiseki @menherahair @phnt @Cyrillic @SuperDicq
You're presupposing the repo's aren't separated however. 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.

Mixing non-free and free packages in a repo would normally be wrong, but Gentoo doesn't work that way. There is no "other repo's" for Gentoo. You can add ebuilds but not repo's. The packages are tagged with a license, therefore (with the exception of wrongfully tagged packages) you can't accidentally install the wrong software. Not once does Gentoo ever encourage installation of non-free software.

If you think Guix is okay despite the non-free nonguix repo, then I don't see how Gentoo which doesn't allow non-free by default is any different.