I don't think the VIR has ever been at 200% per day. The highest I have seen is 300% per year (and that's when BTC is rallying big time). I think that must be a bug.
It did, during a few moments, because of a loan at 88 888% a year taken, and because most of the loans were in VIR and at this time VIR loans didn't influence the total VIR (which can seem logical but allow for enormous rate volatility).
By the way, since I'm here: no it's not a ponzi, you have a live example of why not, and no I won't go anywhere with your money. My proud will be a long lasting and profitable service

Cheers
Raphael