Manual withdrawals aren't a big problem if you don't need the money urgently. I waited 2 to 3 hours for my first withdrawal. The money arrived without any issues as USDT in Solana chain. Of course instant withdrawals would be better. Perhaps they could offer this for accounts with high wagers and top-level security. Processing all withdrawals manually also requires a lot of manpower.
I think it would be better for both the casino site and the user if things were automated for small account withdrawals. But for large withdrawals, they should definitely be checked manually.I used to think that all withdrawals on casino sites are automated, but I only found out later by googling. Small withdrawals are automated and large withdrawals are checked manually.
But as they are becoming more popular, hopefully they will make small withdrawals automated.