TTobias Geerinckx-Rice wrote on 8 Apr 2022 18:01
(address . firstname.lastname@example.org)
Devin Ulibarri from the FSF rightfully pointed out that the licence of,
e.g., https://guix.gnu.org/en/screenshots/virtual-machine/ is not
obvious. It should be made so on the Web page itself.
From memory I'd say these are ‘public domain’, and  concurs, but I
doubt  was explicitly intended to cover these images not contributed
by Luis Felipe.
My Web mail can't find it, but there's an ongoing thread about
relicencing the blog posts to CC-(BY?)-SA-whatever 4.0. If it applies
well to images (and I think it does), that or CC0 seem like the two
Sent from a Web browser. Excuse or enjoy my brevity.
— last section.