I deposit my funds in a casino using a low-priority fee. I managed to triple my bankroll by playing a quick game of Blackjack with huge bets. But since my deposit is so frickin slow to confirm while I don't want to bump my fee since it will create a different transaction on my account. Due to my winning streak while still waiting for many hours, I decided to just play slowly using a 1$ bet. This 1$ bet grows to all-in because I just keep losing for an insane lose streak just because I can't withdraw my funds.
Sharing my personal experience of my recent losses so that no one will commit this same mistake. Bet responsibly. I will stay away from gambling for a while now that mempool is starting to suck once again.
DON'T GAMBLE IF THE INSTANT WITHDRAWAL IS NOT AVAILABLE!
And you shouldn't have attempted making withdrawals as at when the mempools was having issues and truly you were impatient and I'm sorry you had to learn the hard way.
I know how he feels since I also happen to experience such things. I deposited around $30 after I received our weekly payment to an instant credit casino. I played and won around $600+. But due to the deposit isn't confirmed yet, I decided to continue playing. While playing I always look at the blockchain if the transaction is confirmed but sadly it hasn't. So I continue to play until I got hooked and busted . Due to getting hooked in the game, I happen to increase my bet and that move drained my fund. The transaction confirmed after 24 hours.
I know I could have waited to secure the 20x winnings but like @OP, I was too impatient to wait for the deposit confirmation and decided to continue playing to occupy the time while waiting for the deposit transaction to get confirmed and got hooked.