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Seems as though once an account has been flagged for this kind of harassment it continues indefinitely and effectively their accounts will permanently have to endure their painfully slow manual withdrawal method instead of the automated withdrawal method which is the default.
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The bolded bit - that's down to normal security precautions. If you have been messing around using VPN's and whatnot, they HAVE to put in delays because they have no idea whether the next time there is going to be a genuine problem, and guess what, if there is, they'll be the ones blamed.
If you don't like Poloniex, use another exchange!!! There are loads of other exchanges out there, pick one, stop all piling into Polo and then moaning.
This is interesting since there's no mention of any restrictions on using VPNs in the Terms of Service.
If they don't want people using VPNs then they simply need to make that clear up front.