What countries? I don't think there's a country that imposed "every gain" is taxable. What more for low earners? Correct me on this if wrong.
Crypto winnings are unregulated. There shouldn't be any tax. The tax part will be on our cashout where our winnings will be sent first to a crypto exchanger then have it convert to cash. That exchange is regulated so they are the ones paying tax. The reason why we see their rates are low or having a crazy cashout to fiat fees.
It's really too cruel if there are countries that impose taxes on every gain earned when playing gambling. Because I also feel that no country provides
taxes in that way. Moreover, the victories that we get when gambling are not routine. So if they add to the burden of taxes it will make people avoid
playing gambling in that country. It makes more sense for taxes to be imposed when cashing out becomes fiat. Therefore, almost all exchanges
have started to implement KYC, so that the government can get taxes.
In case of losses surpassing winnings there won't be any taxes to be paid. Anyway I doubt a considerable percentage of crypto gamblers are taking these taxes seriously, and in my personal opinion such taxes are really ridiculous, because it's already hard to make profit from gambling and those who finally achieve it will have to share their profit with their governments.