Suspicion of Insider Trading at Poloniex: "Poloniex published an announcement that it is going to delist 17 altcoins. However, there are signs that someone knew about Poloniexs decision to remove some altcoins before the official announcement on Twitter." ->
https://coinidol.com/suspicion-of-insider-trading-at-poloniex/ and? Even if it was insider trading why would that matter? It's not like anyone is going to get in trouble, there's no regulations in crypto trading...
I think people complaining about it lost buying the tops for those coins. It's not like this is something new, insider trading and all that fun illegal shit has been going on since the birth of crypto.