I come across writers who haven't read the rules, and use photos from Unsplash, when the whole point of Our Photo Stories is to use our photos... or don't credit them, so I don't know if they're just nicked off the web. Mostly, it's been painless, but it is clear that some people don't read the guidelines before submitting.
Admittedly, I don't think I've read yours because you invited me, rather than me going that route, and I just assumed it was normal good practice rules... which worked on my last submission.