> If you owe the US government money right now they can take it out of your bank account.

Yes, but they can't see your transactions unless they go ask your bank. Now, they could do that, but they're not set up to do this for all transactions. FedNow changes that for all transactions within FedNow. The government wouldn't start taxing transactions until FedNow is the only game in town or all other payment systems also give them that kind of visibility.

As well, with FedNow they get real-time transaction visibility, which is very different from getting non-real-time batched transaction data from banks.

> Yes but your legal remedies might actually be better under FedWire. US fourth amendment law has a massive loophole whereby if a private business "voluntarily" assists the government it doesn't count as a search. So if the government searches your government bank account you'll have potentially better remedies than if they ask your private bank to pretty please send a printout. (and there's very little chance your current bank tells the feds to shove off and come back with a warrant in that kind of situation)

This is a very good point.