There is currently a thread on the STEM forum in the UK about digital skills, I will reply and suggest students need to be aware that companies such as adobe are doing things like this (as in using user intellectual property (rather than photos) for AI training, but making it opt in)
Students need to be aware that they own their photos and this sort of abuse is not acceptable or should not been seen as such. You should be GIVING consent not opting out of consent.
One hard hitting suggestion could be that AI could be applied to their photo and used to produce fake porn for example, and they have little rights to remove as they opted in as part of the long terms and conditions.