Ask you frieend is gambling legal in their country? if they use bitcoin, of course there is something that makes them have to play gambling in online,
which I know is only in Macau, the only place in china that gambling is legalized. besides that place, I think there are certain rules such as prohibitions..
No, it is not legal in China. Not all the gamblers in China gamble legally. Very few people gamble in the main citys casinos like in Macao. But government does have their regulations and gamblers in one place may not mean it is legal. I think that China is coming very hard at crypto currency.
They have very strict monetary policies and do not compromise on the value and importance of their currency. But it is flourishing in other countries.
Gambling is not allowed in china but the government of china does not consider lotteries as gambling.
You can have a good research and you will find out many online gambling sites in Chinese transcription that accepts bitcoin and other crypto currencies. There are so many gambling games and lotteries.
But in Hong Kong people gamble. They only consider it illegal when one bets with a bookmark or betting in a place that is different from the established gambling place which is the Hong Kong jockey club.