A grand jury can indict someone in less than 10 minutes. I’ve been in one when it happened. There are no rules about how much evidence the prosecutor has to present, just that the grand jury has to reach the numbers needed to indict. The only reason a grand jury is delayed is because the cops or prosecutor is taking their time about it. Since we know that the cops and prosecutor care about rich folks and want to make sure they’re ‘taken care of,’ it makes sense that this was brought in as the first case on the prosecutor’s list.
If I remember correctly, they can be anonymous. If that’s the case, they wouldn’t really be easily taxable. Still, we are talking about the government here, and if they tax lottery winnings, I would bet they tax rewards.