Here's our policy on fees:
Deposit: Usually blockchain fee or fixed fee if deposit is from an exchange. Depends where crypto is sent from. If buying crypto for a deposit, there would be fees from 3rd party service provider.
Withdrawal: No fees

It's sad you don't use the Telegram wallet service, deposits and withdrawals would be instant and deposits would cost nothing to your customers. And they would certainly feel more confident to be able to use your casino without having to leave any funds there after playing.