@allison I think a lot of other EU countries don't recognize it or don't recognize it unless the author has been dead for x amount of years. I can't name any off of the top of my head though.
I also know that some countries like Russia treat public domain differently. In Russia, you are still required to credit the author.
CC0 and the Unlicense both have fallback licenses. I personally recommend the CC0 for non-software works.
@xianc78@gameliberty.club Which ones? IIRC the main culprit people usually cite (Germany) actually does let you waive copyrights but certain reputational rights don't get waived no matter what you do. Anyway, it's not like I intend for this to be some airtight legal thing, and if someone has concerns, they can always contact me privately and I would be more than happy to work something out for them.