I'd say this is what technology should do: to efficiently reduce waste in our world, so we have fewer trashed flats. Of course, the solution should not be intrusive, using public data should be totally fine.
The problem is what qualifies you as a flat trasher in their minds? Having a 6 pack of beer in the background of a picture? Maybe they take exception to people who smoke weed. Maybe they think if you're gay you're more rowdy.