Having a tax may give benefits to their country because they are paying their contribution because they are earning a large amount of money not all the time you are just earning and we have a different set of rules in our country regarding the tax if you are a large time earner its there's a designated amount of tax will be given to you. But of course, you cannot get your money when your dead so its good to be fair to the country to give a small amount of your total earning if you want to lessen the tax I think its a different conversation or story.
The point here is "implementing a tax on a gambling platform", which means on the business, not the people or the gamblers as that's very abnormal. Of course, it will help the government as tax can be used for government projects, but they should not only be concern about the tax, they also need to ensure to put a law that would protect both the gamblers and the gambling operators, but mostly the people so they'll be responsible in gambling.
As a gambler, that's what I only want, to enjoy gambling without thinking of taxes because it will give us 100% entertainment. The logic is, most gamblers lose money, so why pay taxes if we win when we are not getting any when we lose, and besides, most gamblers just play for fun, so they'll not track their winnings and losses.