I never bet to many money on cryptocurrencies. But i also made some huge losses. The most of them just because i dont want to sell and hold the coin, and now they are worthlesss. As example the ETHgas airdrop coin. Before the pump i buyed some for some dollars. On the peak i could sell it to one ethereum. But this time the ethereum blockchainw as totally overleaded so i could not make any transaction, and i think it hodl it because it will be worth a lot more.
I always bet small amount which is in my range and which I can afford. I never put big money in a bet because I know that it is very risky and the winning chances are few. I will lose my money. I lost several times I dont remember that, but I also won several times. I never kept records of winning and losing money because it is not my regular business.
I think that losing cryptocurrency in gambling means not only losing money but also losing a source of income. Cryptocurrency is a business and you can make good profit if the price rises, therefore I think that one should gamble only in his local money. I also lost many times but I dont remember how much I lost because I never assumed gambling as making or losing money. I always gamble for fun and enjoyment.