Want proof? Here you go:
They will gladly take your money, even though I don't really understand what this means. 12 of 12 confirmations and still pending... Hmmm...
Here is me trying to withdraw BTC from my XRP trade, after clicking the verification email link to confirm its me and I really do want to make this withdrawal. As you can see, the withdraw request was made over 24 hours ago and despite what is says in their "Support" section (what a corruption of the word), I have not been contacted by anybody. Obviously they have my email address, so why no follow-up?
Here's me re-visiting the withdraw request link in my email, just so you can see that I actually received the email, and I clicked it again thinking maybe I didn't click it the first time (even though I did), after all, it says "Awaiting Approval" for my withdrawal status.
Here's what Poloniex has to say after I clicked the link in my email. "Oops" is right. Assholes. (Them, not you.)
Finally, here's an example of how slow and useless their support team is. I would say this is proof they are either readying for an exit scam or else practicing fractional reserve banking, which means they don't actually have the coins to send me. As you can see I created these tickets an entire month ago and have received NO RESPONSE WHATSOEVER from them.
No telephone number. No email address. Nothing to do except for sit and wait and pray.
TL;DR - DON'T USE POLONIEX OR COUNT ON THEM TO OFFER _ANY_ BIT OF SUPPORT!
Yes this is the problem with centralized exchanges like poloniex. We are in desparate need of decentralized exchanges for instant and riskless transactions. I hope we will get more decentralized exchanges.