This is the irony in cryptocurrency. We are promoting decentralization in coins but we are using centralized exchange. The goodness of having a decentralized exchange is to secure from the attempting by the owners to steal our exchanges. That's why, it is not advisable to keep your coins at centralized exchange. More over, a lot of decentralized exchange are existing right now. I oftentimes update all ICO that is related in exchange because I know someday, centralized exchange will gone and it will change by Dex.