On Yifu's defense, He did offer a FULL REFUND to everyone who ordered Avalon Chips. At that time each 782BTC order was worth atleast 100k. If he really was a scammer he would've kept that but he didn't, you need to watch what you say and flame somewhere else.
I'm sure all those people who had already prepared their PCBs and bought hardware to complete large batches of miners are very happy with Yifu's lack of organizing talent. Not to mention some batches of chips ended up in China in the hands of some shady resellers instead of the customers who paid for them