It IS about stock photos and other art which creators are happy to have used as stock images. I'm not sure what you mean here.
Using that in the title is not a requirement, but a "recommendation". Most don't, because they are free to choose. It was suggested merely as a way for others to find such posts, because we're using the Hive interfaces and have to work with what we've got.
RE: About Stock Images and Important Information. Please Read First