Yes a DEX is a decentralised exchange. It allows for P2P trades and allows you to keep your keys too. I agree that P2P should be used over Tor in some cases but if you're in a network like STEEM we could do P2P too with your account and a VPN @swapsteem has P2P option
RE: Bitcoin Isn't A Great Financial Tool....YET! 3 Developments I'm bullish about!