it lost 50% ico. Someone is dumping shit out of Rise. Looks to me scam. Why the hell people sell at loss? It must be manipulation.
There is definite manipulation. There is a block of 100 BTC plus orders that suddenly appeared out of nowhere - if it was a set of multiple natural buy orders there should have been a significant rise in price. Instead it seems like someone is just putting up a buy wall with the intent of later pulling it out and collapsing the price. It's an old whale trick to cause panic.
Edit: It has happened several times with WAVES just before a major FUD offensive.
All that said, that does not make it a scam. The devs aren't responsible for how people trade on the exchange. It is out of their control. The only thing that can combat this kind of manipulation is big volume and I don't see that any time soon.