All of these exchanges are greedy as they disable ada,xrp, tron withrow and lock your coins for days and you can't do anything about it, nor you can move them into another wallet.
This is the paradox if you trade decentralized cryptocurrency on extremely centralized exchanges. New generation of marketplaces (e.g. blocknet) will hopefully solve it. Nowadays, we cannot do anything about it.
There are several decentralized exchanges/protocols in developing, like Kyber, 0x project and Loopring. The future belongs to the decentralized exchanges.