I have seen many complaints about Poloniex delisting some shitcoins without giving users enough time to react. And once the shitcoin is delisted, no withdrawals or refunds are given.
I'm not going to go into too much detail but they did a 33% socialized ripoff and then sold my coins at the lowest rate retroactively from the past year and sent the funds to my attorney general that were left over. All this while my funds were locked for a year while I fought them on KYC. It was not shitcoins as I haven't mined and sold them since at least 2015. I'd get a lawyer but it would cost me more than the few thousands they stole. They also stole 100k Monero from Risto which I'm sure had nothing to do with his death.
Wow. I once was hired by someone like that. Underpayed me 2K because he knew I was not going to hire a lawyer for such a small amount. Who even owns Poloniex now? Is it still Circle?