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That's a caption, not a watermark. This one has a watermark, and was clearly taken from that popular vendor of stock images, shuttersrstsck:

https://i.imgur.com/Nytlb16.png

Raises some questions about what is able to be copyrighted vs. derived works if the generated image was produced by this algorithm and doesn't actually exist in Shutterstock's (excuse me, Shuttersrstsck's) database.

I was referring to the gray bar with text on the bottom. Its supposed to have the URL for the website rehosting image, like the bottom white bar in the image you linked to.

Some of these are the stuff of nightmares.

Yes, that's one of Cthulhu's favourite memes.