Basically he will not lose $80 if he did not sell his polygon as he can keep holding it till the price to increase again.
This is the double edged sword situation when we are dealing with crypto, sometime the price can give us a significant lose but on other time it can give significant profit.
Will he complain if the price increased significantly after he received the withdrawal? I dont think so...
I guess he needed the money urgently which is why he converted it to FIAT though this wouldn't have been an issue in some countries where there is a clear premium on the conversions.
Also, he could have stuck to stablecoins like USDT etc if he was so worried about the volatile price movements of crypto.
Probably he wants to gamble and benefit on the token price growth at the same time. I do this too whenever I want to gamble but don’t want to miss out the price pump due to the bull run. Matic is my best choice too aside from Doge to use on deposit to the casino because it has a very cheap transaction fee and at the same time quick to confirm.
This is the risk of doing this trade and gamble at the same time since casino sometimes delay withdrawal for their own personal reason. Sometimes this kind of delay helps us to hold more and sell at better price instead of selling it immediately while the token price still pump more.