From the start of first days to today there has been a lot of development and that is not really that easy to achieve but they did it. It was like "develop, present, let them gamble, get feedback, develop, present, let them gamble, get feedback, de.." type of cycle that they did for a while and whenever they were on the develop stage they stayed silent. Right now it is at "get feedback level" I assume once again but there is really no feedback I can tell you.
It is not easy to build a casino, to start off with you need a big bankroll just to keep the games going and there will be times players will get lucky. Of course its blackjack and it has a house edge and basically it earns the casino profit over period of time but in the end there will be some lucky people that will earn a lot.
So, you need money, you need coding experience as well. Writing code for a casino is a very tough task, you need to consider all the bugs and glitches and security aspects of it as well, every single day and every single minute there will be some hacker who will try to find a way to take your money away from you.
And top it all of you need to have amazing marketing and connection with the customers as well, that requires a lot of time too and you need to work with people who know how to do it. Basically all around blackjack took time to be here, they are now pretty good, they will definitely get better too I believe in them, but it was actually quite a good ride with how many things they had to do.