I will not blame the known scammer here but those users who will buy his coin. It is already known fact that he is a scammer, and yet people are still sending him money for his scam project? So it is their fault if they will get rekt on this.
usually people who are still buying their coins don't know that the project is a scam, and they will regret it when they find out that it is a scam, so it's completely not the fault of investors because maybe some investors still don't understand cryptocurrency.