Let's say I want to release my work into the public domain (at least effectively, as near as is possible), but I don't want evil companies like Getty and Visual China Group taking my photos, then licensing them to others for ton of money when they were perfectly entitled to use them for free. Apparently this is legal - see this article.

What license should I use to achieve this?

This image by Carol Highsmith is in the public domain, but Getty will still let you pay them over £18,000 for a license to put it on some billboards

Let's say I want to release my work into the public domain (at least effectively, as near as is possible), but I don't want companies like Getty and Visual China Group taking my photos, then licensing them to others for money when the end users were perfectly entitled to use them for free. Apparently this is legal - see this article.

What license should I use to achieve this?

This image by Carol Highsmith is in the public domain, but Getty will still let you pay them over £18,000 for a license to put it on some billboards