> if you receive BTC from one of these addresses as payment for something, do you refuse it? You cannot refuse a BTC transaction. You could return it in a subsequent transaction, and pay the transaction fee, but I would imagine your address would be forever tainted by a number of illicit address/transaction tracking algorithms.
Source: $7.5B In Stolen Bitcoin from 2016 Bitfinex Hack has just been moved | Hacker News