How is the app accessing my photos on iOS when I have not given the app permission to access photos? Did they really find some exploit around this? Or is this photos permission really not the only way?
So you granted Facebook permission to access your files in order to share a photo in some group 3 months ago, but now they secretly abuse that permission to scan your entire library for AI training.
My guess is that this only affects people who have granted FB the permission already.