Today, in regulated gambling online casinos or physical casinos, there are probably taxes that are taken from the owners of this gambling.
But for gamblers in the casino, I don't know if there is a tax, but from what I can see, it doesn't seem to be there yet, so if they implement it, it will be a bit heavy on the part of the gamblers.
I am totally new to this kind of setting as I have never heard or even experience anything of this sort like and I have being gambling and also winning for quite some time now although I guess my country doesn't have such rules besides even the general tax payment is a problem in my country not to talk of taxing on gambling. Seeing say that taxes are deducted from people winning is completely strange and new to me although I don't know much about lottery tickets.
I have made a lot of bets but I don't know any information about paying taxes to the government exchequer separately. Business or employment should have the obligation to pay income tax and if you are eligible, you should pay tax.