I don't really understand... What were you expecting?
It's a casino. Their only goal is to make money.
If you're a big player that means you made big wins. They want to check that those wins are legitimate before paying you out.
It would be the exact same thing in a real life casino. If you win a too high amount they will make you wait so they can analyse the pictures taken by cameras to be sure that you haven't cheated.
That's just to protect themselves from new hackers and bug exploiters that's all. Nothing unusual.
I agree they would be indeed be checking your earnings all pretty big and in a day, must have triggerd some flag so. Instant withdrawals these days are problematic and every one facing a issue, so being little patent is nice. In the end good thing is it got sorted, you could check other casinos like bit dice, I like the site and found it suitable, and of course you can check reviews out here, since you are vip you might have a better team to Carter to your needs.