If the management ensures that gamblers get their money when they try to withdraw, then I believe working on the withdrawal time won't be that difficult. Most casinos upgraded from manual withdrawals to automatic ones, and I'm sure Spinly will upgrade for the betterment of gamblers.
There's something we as players like, and that's that withdrawals are immediate, just like deposits. When we deposit at a casino, the casino doesn't hold the deposit, it accepts it, and then we start playing. It's not bad if we demand that the treatment be equivalent, especially when the corresponding KYC is completed.
I've had bad experiences when people tell me that withdrawals are small. It drives me crazy, and I'm not even anxious.