Beware of Poloniex,
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.
I mean, do you actually understand what a Ponzi scheme is?
"a form of fraud in which belief in the success of a non-existent enterprise is fostered by the payment of quick returns to the first investors from money invested by later investors."
The earlier investors in Dash and other altcoins, even the scam ones, are not given payouts, they still trade them as is the point of Poloniex. Therefore none of them are Ponzi scheme nor scams in the sense that you describe them.
Regardless, Poloniex does not use bots, it's only Poloniex
users that sometimes use bots to enhance their trading, as they sometimes do on other exchanges as well. This is nothing new.