Last year, IHG Rewards Club/Etihad Airways/Best Western Rewards were caught using the same stock photo (read more here) on their promotional messages.
A reader just forwarded me photos of the current Best Western Rewards & IHG Rewards Club promotions where these two hotel loyalty programs are AGAIN using the same photo (can this really be a coincidence?).
These companies could pay more and get exclusive use for the images that they have on their promotional messages, but I guess that they are just plain cheap.
It is usually OK if unrelated business end up using the same photos but not when they are competing with each other.