I don't know how trustworthy they are but this feels bullshit. how does your betting help their security check? if they have an explanation on why your betting would help finish their security check faster, I hope they explain it. at the moment I agree with AnotherAlt, no offence to fairspin, but it feels like they want you to play more in order to lose your funds.
Yes, it sounds like a bunch of bullshit. As much as I understand that casinos want their customers to keep gambling instead of withdrawing their money, asking the player to wager more just to speed up the security check is absurd and utter nonsense. Also, the casino's security check took a long time, which shouldn't happen at a casino that values its customers. That's very suspicious and worrying.