Based on a filter/editor they provide? It may be the picture that I took, but they provide the way to edit it and post it on a social media site.
I'm sorry, I'm just not worried about this. They can have all the pictures of my dog for all I care. I didn't start the account to make money off my photos. There may be a problem if your a pro photographer and they sell your photos to a magazine, sure. But to 99.99999999% of us, it doesn't make a difference and shouldn't.