I follow a bunch of writers on social media and saw someone share this beautifully designed cover.
I'm not a big romance person, but this colorful cover caught my eye. It looks really professional. When I clicked the image to enlarge it, my Pinterest extension kicked in and did something weird. It popped up in a new window with a reverse image search on the cover. I didn't know it could even do a reverse search. The first item in the search results wasn't this book cover; it was another book with the same image. I was curious if I could find this photo elsewhere. Within a few minutes, I found five other covers with the same stock photo.
I've used a stock photo for my cover for The End of Refuge, but I was careful to pick out an image that was unique. In a fit of paranoia, I also did a reverse image search of my cover. No copycats yet. I still have nothing against using stock imagery in covers, but recommend doing something to make your covers a little unique.