The Mechanics of Open Source

Here is how free software works:
https://pixabay.com/en/forum/official-pixabay-news-2/the-pixabay-license-7823/

people shared various images under creative commons license, and one day site owners suddenly claimed ownership over user images, promising to sue anyone using them under free license.

>>25
Thats the theory. Megacorps with dedicated lawyer brigades who study every single loophole in existance would not hesitate to bankrupt anyone trying to defend the "public domain". There lots of gotchas on how things like collection copyright and derivative works apply.