Can You Make a Black Hole Out of Dark Matter?

It's harder to make a black hole out of dark matter. We don't think dark matter feels any other forces other than gravity. So you can't push on it, for example, to compact it. It doesn't stick to itself. And that means it's hard for it to give up angular momentum. Even something that feels nothing else but gravity will eventually lose its orbit because it's giving off energy into the universe.