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I was wondering the same thing, and checking the images they are hosted on https://craiyon.com/

Craiyon - Create AI Art with our free AI image generator.

There's a crayon in the bottom right corner of each of the images. Perhaps someone recognizes it?

Yea they're all AI generated! I used this site https://www.craiyon.com/ They have a free tool for image generation

The crayon is indeed a big hint: https://www.craiyon.com/

They look AI generated to me.