I'm ok losing in fiat but not in losing coins like Bitcoin, Ethereum or Tron because the coins I've lost could be ten times higher next week or next month, that is why when I am playing in Crypto gambling sites I just allocate that I'm comfortable losing I don't want to mess up losing my coins after months of waiting for it to increase its value.
you buy your coins using your fiat ? if yes then you shouldnt regret because you said you dont care when you loose your fiat but you gotta be more careful if you only earn your coins online because that is more valuable . you put effort on it thats why and its not also easy to earn a huge chunk of crypto online nowadays . given that you regret using a crypto why can you just gamble using a fiat because that small cryptos that you loose can still be worth huge especially if you save them together .