Just want to add up;
5.Fairness
6. Sites UI/UX
You forgot the things which are considered one of the most or even the most important things
to be considered first on a good gambling site.
Aside from that, the acquisition of
gambling licenses for me is a plus.
It shows to the gambling community that they are serious in operating their business.
So you have peace of mind that you are dealing with legit site & the chance of running away your money is minimal.
But for my other top 3 important features -
1. the provable fairness
2. minimum deposit/withdrawal amount
3. fast customer support