Very wrong to say this. People who don't know exch will think that exch did all the job and helped them to launder the stolen funds. Exch is just another service, an instant exchange, which is a normal service that there are also other instant exchanges out there. It just so happens that they've been used for that. But if they weren't used by the hackers, they won't be thought of that. Too much damage and slander already done to them where in fact that they have already decided to close down the service.