I use poloniex since 2017 and it is one to the best crypto exchanges available online and to some extend we can trade and exchange cryptos anonymously in poloniex but if some one wants to use it permanently then he needs to verify account as a side note their support service is so bad and they change their terms of service more rapidly without intimating the users which might leave your funds at risk, if they increase their support service and makes their term of service more user friendly then it'll be more appreciated.