Why did the cold card hackers send all the money to one wallet?

Wouldn't it have made more sense to send the money to all different wallets and also not to do it all in one go. If you move the money slowly as the hack is discovered each into a new account, yes you might lose some of the money because ppl move it out but not everybody will do that in time. But by doing that, now you cannot distinguish between the hacker and someone who just wanted to move their money out of their wallet.

Now they have the entire world and law enforcement looking at this one account.