Right. Since they have your information and they know how you usually play, but you suddenly do not match your previous pattern, then the casino may suspect you. From the point of view of a player, you may say it is not wrong to complete the wager and withdraw the funds, which I agree. But if you see this from the casino's perspective, that player is not good for their business.
A company has all tools to do that, from their Terms of Service, Terms of program like bonus, and many mechanic, digital tools to do things against user abusement. As user, you need to obey to their terms, and don't try to cheat them, because in the end, you will fail. It's big risk and if you know that, no reason to do this at beginning as troubles wait you at the end.
The player was invited because they were VIPs on other platforms, and the casino offered him a bonus to be a regular player on their platform. Not to withdraw the funds just after the deposit. I do not want to blame Razed for that. It seems like the community members agree with that point.
It is not about abuse on their bonus budget, but more importantly about AML against money laundering. If a casino allows users to deposit money, and withdraw it without any bet, any wager requirement, it opens big holes for money laundering.
I think some people can disagree with me that, centralized exchanges don't require any trade before withdrawal, that is true so far. With gambling industry, wagering is a standard requirement and all users have to know and accept it before deposit money.