One main point you left out in your list in my opinion, is checking if free bonuses are really paid out if you make a win with that. So you also should test and review this point. Over the years I have gained a lot of experience on gambling sites and have registered with many of them using a freebonus code. From my experience many sites making problems if you make a bigger profit with this bonus. Often reasons are given why the winnings cannot be paid out or your account is simply banned and they no longer respond to support requests. Or they suddenly ask for a KYC without being a prerequisite according their ToS.