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.

>>3

Why did they make their own license instead of allowing the use of CC-NC(-SA)?

Because CC-NC still allows distributing on other sites, while Stallmans are greedy and want everything for themselves. I.e. -NC license was made to help artists get publicity, without completely losing copyright. But it still could be useful for other people. Like i.e. when you need to write a research paper on neural nets and a collection of tagged photos, it is okay when they are -NC.