Ludovic CourtèsImagine a blog that has received contributions from ~20 people over 10 years and oops! we hadn’t clarified the license of those blog posts.
Just need to email them all, right?
Well, even for that simple case, it took 9 months to get a reply from 90% of them:
https://lists.gnu.org/archive/html/guix-devel/2022-11/msg00325.html