Doesn't seem to matter whether I spent the hundred dollar bill with the specific serial number provided by an OFAC-sanctioned individual, or if I kept that seri

Doesn't seem to matter whether I spent the hundred dollar bill with the specific serial number provided by an OFAC-sanctioned individual, or if I kept that serial number in my wallet and spent a different piece of paper, since currency is fungible. By analogy, there's no practical difference between a balance in an Ethereum address getting dusted with tainted funds, or a Bitcoin address with a tainted UTXO that I don't touch.