Withdrawing in a rush. It could happen for those who just earned their money thru bonuses. Like one player who did a faucet and somehow got lucky and made it 100x the amount. They will be the one affected by this sudden dump in the Bitcoin price.
The lucky gambler hits the big jackpot then he doesn't care about the market price and he immediately makes a hasty withdrawal to buy what they have been craving for a long time but if he is an active community of traders or gamblers then half will still keep BTC for asset reserves.
When a gambler can hit a big jackpot, he needs to withdraw that winning money and not use it to play just to try to hit another big jackpot.
This may not have anything to do with market price movements but more to protect yourself from overusing your funds after getting a win.
A drop in the market price will make us use more satoshi, whether in bitcoin, ethereum, bnb, or other coins.
But, gamblers are not worried about this problem because they only want to gamble without considering the price.