Therefore, they cannot transfer cash through banks. Bitcoin and cryptocurrencies are seen as the most suitable method in this regard.
Banks are now accepting crypto as options for transfer, and because banks know that they can't simply stop people from looking for alternatives so they better accept it or lose customers.
Banks are just getting smart, they accept Bitcoin and some Altcoin to tap the market for possible profit. If banks don't see any profit in these cryptocurrency ventures, they will ignore it no matter how huge the Industry is.
People would be still surprised. Even at this point, maddive adaptation of this technology is still not clear. It is just that most of the gambling dites nowadays are crypto-based.
It is already clear that many company and even some country adopted blockchain technology. It is proof of massive adoption though I agree that the first mover is the gambling industry.
I'm not sure if it is whether lower transaction fees or anonymity of the players which pushed gambling houses to go online and to hide in this blockchain.
It is both and in addition, those who are unbanked use cryptocurrency to transact online besides, online services have no boundary, and that is the major reason gambling houses goes online. To cater services regardless of timezone and region.