I never thought that any player would have to pay tax on their winnings, including in countries that legalize gambling for their people. I think that even in countries that legalize gambling, this shouldn't happen, because paying taxes is the responsibility of the company alone, with players or visitors not having to pay taxes, but with a government that wants to tax more, maybe that makes sense even though it sounds ridiculous.
With a country that prohibits gambling, there must be a large part of the community who gamble but in secret, especially now that there are so many online casinos operating, of course this opens up greater opportunities for those who want to gamble even though it is prohibited in their country.
You can say that but many countries also imposing tax for their citizen especially for those who receive salary. The government impose tax to develop their country because they say that tax will be used to build more good things in their country. But unfortunately, not many governments serious with that because we know many government officials corrupt the tax money for their own interest.
So that is why we also hear that many citizen avoids to pay the tax because they know that the tax money is not use for develop their country. It is why the government becomes more strictly for their citizen but I don't know why the government don't impose a high taxes for the richer people. They chase the middle people classes to pay the tax and educate them to pay at the right time because if not, they will get fine.
That's the half-truth. Because even if someone can gamble "unnoticed" via crypto, at some point he will have to withdraw in fiat. So either he will pay taxes directly to the provider or to his government tax authorities. However, there are some ways/ tricks that somebody can do/ use but everything depends on your country, the amount, and yourself as a taxation entity.
Even if that person withdraw his crypto to fiat, he doesn't have to report his winning to the government because he use crypto to playing gambling. The taxes that will applied to him will just based on his salary or income so that will not come from his winning in gambling. But gamblers will know what they need to do related to their winning in gambling and if they think that they want to pay the tax because that is the thing from the government law, they will pay the tax but will hide their winning in crypto.