They use bots to pump and dump coins and ponzi schemes, at the moment the exchange is pumping DASH which is a ponzi scheme, they create these big pumps, attract investors who short them, them keep them stuck for weeks. If you dont know Poloniex is designed to suck in investors, use bots to create fake volume.
the first youre reason i think youre lost in trading
all exchanger all coin dump and pump common thing, not is big problem, only dump and pump you write ponzi scheme
DASH not ponzi coin, DASH is good coin, good user community, good volume transaction and old coin