That is amazing and, as Haystacks says, scary too. Just think of the privacy implications.
For us punters I wonder whether the next thing will be the identification of premises? For example some while ago a lot of passionate encounters (Chiswick) photos were taken on a bed with a very distinctive frame. Or identification of girl by the tattoos she has.
Sounds far-fetched, but to be able to identify a picture that is largely obscured does too. Maybe there were other similar photos where the picture was not obscured?