I think it's an easy way to land yourself in jail. If you keep extorting people or hacking information and they find out, fair enough they may not be able to track you directly, but as a pattern develops or sales and purchases of stocks, it begins to narrow down who it is that it could possibly be. Tor is not the place for something like this and anonymous groups certainly are not the way to do it - I speak from experience of knowing people foolish enough to try it.