Well one, that's a lot of work..I imagine they have an immense amount of followers meaning they'd have to hand pick who they want to see it..every time they post a picture.
So I can see how they don't care enough to do privacy settings, but at the same time I doubt they condone the spam of their life also. You know?
It's like something you assume would happen, but if you don't really know about it you don't care..but once you see evidence of it, you go "ehhh..that's kinda weird."
Not saying there would be any confrontation, not saying you should necessarily stop, it was just a thought that occurred to me and thought I'd share it.