It shouldn't be this hard to change the mining algorithm, but they are letting the selfish mining happen.
It is easy to tell what is going on

Its too surprised to know the issue. And most of all, an reputed exchange like Poloniex is supporting this, intentionally or unintentionally even losing their high reputation? Coin itself look like another hyp on market, but supporting party like Polo make it hard to be a true hyp. We really wants to know more depth...
Good question (Y)
