Feel free to add Poloniex to that list of unfair crypto exchanges. I read somewhere on the forum yesterday that their bitcoin withdrawal fee is over $200. It's something like 0.003 BTC if I am not mistaken. It's pretty clear that they want you to give your bitcoin to them and either trade it for some altcoin or withdraw a "bitcoin-token" using an alternative blockchain. Either way, the result is the same: the BTC stays with them.
Are you sure that is the correct information? I know that some CEX (like YoBit) had a fixed withdrawal fee that was quite high even when they had some reputation, but if someone asks for even $200 to withdraw your BTC to a non-custodial wallet, then it's not a fee, it's pure robbery.
@examplens, considering that @icopress
advises not to put ref links in the signature, there is always the possibility of using a website link in your profile - that way you get some kind of visibility and the option of not having to send a PM to anyone even if they ask you for a link.