I think that is very unfair and you should be very careful with what you're saying. The guy behind YU is just one person (and a young person too) and he has been working his backside off to get these A300s made. He initially started with a new factory that struggled with the mould creation and printing. This has cost him a lot of his own money, but he persevered and eventually he was forced to switch to a new tried and tested factory that is the one making the models now.
That Z2 American abomination should never have been released but as I understand it they effectively forced him to release it. I would say that was on them not him. Obviously there have been major delays and setbacks.
He certainly is short of money, but has been honest throughout the process and now with the new factory production issues are not a factor. So it is not a Ponzi scheme - it is one young guy doing his best to get models made in a difficult environment.
I might add that YU has previously made 31 other 400 scale models with other brands (AC, JC and Panda) and they have all been delivered and are good models. He has also delivered these first 5 A300s now too.
So unless you have information I don't, and I've spoken with the YU guys for years now and he's never been anything but honest and transparent with me, I think you are out of order.