4 years ago, I trade on poloniex and bittrex , they are the most trustable exchange I've ever known.
I can withdraw anytime without KYC verification. For some reason , I stop trading over 2 years and I want to withdraw the rest of the balance left, they asking me to give them the KYC.
Maybe the different between you and me is you're still new and still not aware that most exchange nowadays require KYC
Poloniex went completely downhill since 2 years ago. I and all my friends used them because they were the top 1 exchange.
However, now no one I know uses them anymore because they decided to require KYC from every single one of their users. Most exchanges actually don't require KYC for everyone (Binance being the biggest one), and if they do, it's only on a few specific cases. But Poloniex actually made it mandatory for everyone, regardless of the amount being traded or withdrawn.