I think yes ,,, I believe IDEX is one of the legit exchanges. during the use of idex I have never encountered any problems, but the coins available on their exchange list are incomplete, probably because of this new exchange
for me IDEX is one of the best decentralized exchanges that we have with huge liquidity and safety features. You can easily withdraw your funds without any hassle or waiting for KYC.
IDEX announced recently they're launching KYC soon. They're becoming increasingly less decentralized. Look into platforms like Blocknet... it's a bit more work to setup but there's zero interference from third parties.