Granted, but searching bank records requires a warrant and you'd have to have one for all possible banks. Donations might be tracked (if not made in person), but distribution of donations are a whole another story since the people involved were already debanked...they could only spend the cash and they would likely mostly spend the cash in places that didn't scan bills. Even if they directly deposited the money into the bank, there would be no record of who got the donated money (remember, the people involved were debanked so the only way for them to get the cash if it were directly given to them). With Bitcoin, there's a clear trace from donator to donation collector to debanked person stored in the blockchain so it can be retrieved for analysis at leisure. With AI it's possible to greatly narrow down the path to the extent that standard police leg work and warrants can find the path with a high degree of accuracy.