For me, I don't care about a license at all. I only trust old sites that have good staff supports and good feedback from users.
This is a huge factor to me as well.
It says a lot on the operator on how they handle things done. Or if shit hits the fan, how do they respond. A dice site for me has to to survive 1 year minimum for my btc, or i`ll continue to play on the old ones that already built their rep.