I'd be mortified if any of them ever read what I write about this. I get scared because I'm friends with some of their really close friends and I get so scared that they'll find my writing. So I NEVER talk about mibba on Twitter...
I think it's possible any famous person could, though. True, they
are busy, but they do have time off. They actually have plenty of time to creep internet sites. I know that Craig Mabbitt has seen some fanfiction before because he mentioned it in a interview and he said it creeps him out.
I think most people would be... flattered that people write about them, but quite creeped out about
WHAT is written about them. I'll admit it myself, some fanfiction does go too far.
Black Veil Brides mentioned in an interview one time that it does flatter them when people role play them or write fanfiction about them, but sometimes things can go too far and it sometimes causes problems in their real lives.
So obviously, some people DO creep fanfiction...