I had a very sick 8 month old baby who I obviously had a million photos of. Unfortunately, my lil girl had 9 surgeries and her little body had gone through more than people can think of. She passed in May, and it's really difficult to look back at old pictures because of how much stuff was going on, various levels of critical ICU care, pre/post surgery, etc. But it wasn't until a few months after she was born I had gone to do something in Google and realised my little girl's very severe diaper rash, open sternum, chest tubes, etc, etc, etc photos were backed up and tagged in Photos.
This is sort of the premise to why I've de-Googled/de-Cloud myself because I didn't want my little girls pain and suffering to train some computer's image detection AI.
How would this work for a parent of a sick child who sends their doctor, S/O, possibly graphic in nature and personal photos of their own child? I was in close contact with my daughter's doctor, and would send him all sorts, I can only imagine the same is true for most parents of chronic children.