No doubt bethog is a wonderful and growing casino as they prove this always with new improvements.
I think almost all the casino that comes to Bitcointalk allow users to withdraw their winnings, the only difference with some casino is that their withdrawal times something take a lot of hours and sometimes days while for others it's instant withdrawal. I have gamble on a lot of casino here and even outside but in all you get more confidence and more relaxed mind knowing your withdrawal are process with the speed of light.
I don't understand why the casino will take time in processing the withdrawals and it should be instant. Specially for the new casino, they should make sure that they process withdrawals instantly so as to gain the player's confidence. Legit casinos eventually have to process the withdrawals, so why delay

Yes, in some cases, they can hold the withdrawal if they see any unusual activity on any account, or maybe they may put a limit that every account can process this much amount of withdrawals instantly and amounts higher than a certain value will go through a more detailed manual review before payment processing.
BetHog is a very new casino and I am sure they will get better over time. If the amount withdrawn is high, I think it is normal for it to take time. Because account transactions are definitely reviewed. This is not only valid for casinos. If crypto exchanges are newly established and the withdrawal amount is high, they cannot perform the transaction immediately.