For example, if the thing you're taking down does use your content, but it falls under fair use, you can still get away with taking it down. There is no objective test for fair use and 512(f) does not mandate one; the criteria is just that you merely considered fair use. And since fair use is a bottomless pit of grey areas, you basically can't get a 512(f) ruling out of a legitimate copyright owner. It only catches the kinds of people who, say, pretend they're Bungie so they can file DMCA takedowns Bungie can't retract in Bungie's name.