IMO, it's time to change our belief that bitcoin is not money because it is, we are not in the early stage where we still doubt the future of bitcoin, now it seems like the world already know it and thanks to regulation as it strenghten its value.
We are not the ones who decide if bitcoin is money or not, governments are the ones who make that decision, just look at El Salvador, for them bitcoin is money, but for most of the countries bitcoin is just a digital asset. And that's the problem how can you regulate casinos where the users don't bet money?
Some countries might not adopt yet but big countries are already considering or have considered bitcoin as money, or not yet totally but widespread adoption will make it as money.
As definition on money. Money is any object that is generally accepted as payment for goods and services and repayment of debts in a given country or socio-economic context. The main functions of money are distinguished as: a medium of exchange; a unit of account; a store of value; and, occasionally, a standard of deferred payment.
Right now it's not yet generally accepted, but like I mentioned, onces widespread adoption happen which is only possible with the help of the government, it will become money that we can use to pay for products and services, well gambling belonged to the services I guess.
The government has to regulate a casino because even if bitcoin is use or any other currency, but no one had inquire that by not using money. You need money (dollar for ex) to buy bitcoin, and then you can use bitcoin to gamble, when you win, you'll exchange it to money to enjoy it, in this case bitcoin act just like a payment system or sort but at the end of the day, the beginning and end of transaction always falls to money.