I have heard about DEV coin and even made some arbitrage deals with this crypto. But it was several months ago and I just looked today on its price and I was very surprised. DEV made -x50 or more from its price.
Ordinary scammers who merged their unsold tokens after entering the exchange. Then they will buy at the lowest price and release good news and tokens will start to grow again. This is a cunning trick of deceivers!