It’s not common but it’s understandable for a new casino to have some problem with delay withdrawal because they often choose manual approval of withdrawal to avoid potential abuse of their bonus since they often offer a bonus that has good rewards and easily abused by some users.
I also noticed they often post promo codes for free spins, which are no-deposit bonuses. They also have a goblet feature where people can win 20 free spins daily. Once players complete the wagering requirement, they can withdraw the funds without making any deposit. There is a huge chance the abuser would try to abuse the casino with these free spins.
Like others, I like casinos that approve withdrawals automatically without long delays. This helps casinos make players loyal to their platform. But I believe Spinly has a lot more features to attract players, and the lobby is one of them. I like those old age games.