I don't think it matters because AFAIK most casinos value the deposit in fiat instead of crypto denomination.

Let's say you send 0.0005 Bitcoin which worth $54 (BTC $109,000) right now, after a month Bitcoin price rose to $209,000, your money in the next month would still $54 instead of 0.0005 BTC/$108.

So if gamblers gamble in this kind casino, regardless the price rise or drop, it should be same.