Many of us do not play Blackjack but many have become aware of the popularity of Blackjack here in Bitcointalk because of Blackjack.fun signature campaign it seems the casino has many players and they are making money, you cannot keep up paying signature participants up to $100 per if they are not making a profit, honestly they are paying more than other popular casinos like Stake.com.
But still, there are some people out there who might be interested in playing Blackjack and wanted to learn how to play it. For example, I was looking for an app or a site like what op provided where I can learn since I am now interested on playing and learning how to play BlackJack after you introduced the Blackjack game to me despite it's popularity on Bitcointalk. Of course, it will be very obvious to try playing Blackjack. We don't know you might get interested in blackjack, who knows.
Even if I learn the gambling tricks - I am not very daring to risk my money. I think my hard earned money would be gone in trash if I put it in gambling.
But to me black jack has been very attractive always - I would learn it for the sake of information but I would not dive into the professional gambler since my luck never sides me.
Well, there are apps out there where you can play Blackjack without spending real money or cryptocurrency. You can find on Playstore or Appstore if you are not daring to risk your money. That's much better in my opinion and risk free of losing money.