It baffles me when I hear or read news like this. I'm quite sure most of the times newbies get introduced to the blockchain or cryptocurrency through someone who is quite strong and understand how things work here. So how do they become preys to people like this? Why not reach out to the person who brought you into the system or do your own research. Yes, I know sometimes when we do our own researches we still need some clarifications so JUST ASK QUESTIONS!!!. If you do not trust anyone or a particular exchange to trade, look out for the ones popularly known or used that used an escrow system and avoid being victims of cases like this.
Well, we always learn from our mistakes.