It's better to find a provider or casino that can really give us an advantage if we want to bet on the lottery so that we are not burdened with tax costs which in my opinion are inappropriate.
Anyways, I'd rather participate in a national lottery and I'm fine with paying taxes there compare to looking for an effort to find a casino for the reason you have mentioned. But before anything else, what should I be worried about tax as what matter here first is, I should win no matter what lol.
In my opinion, lotteries have only one advantage over casinos. This means that if you win, then you will definitely have no problems with withdrawing funds. Everything will be legal and calm, you will come to the designated place and you will be given a prize.
But that's where I think the pros end.
Who knows what the chance of winning the lottery is?
And the casino has a minimum chance of winning for each country. For example, I know that it is high in the USA and low in Russia. Therefore, it is better to play in the USA.
At the same time, the casino provides a wide variety of games.