If IDEX is a decentralized exchange on which p2p exchanges take places, then why are they worried about whether some of the tokens are securities or not. Variety of ERC20 tokens is one of their key advantages and now they decided to make a delisting.
Seems no one wants to have a deal with SEC or similar organizations. Probably sooner or later only fully decentralized, fully autonomous, anonymously created, smart contract-based exchanges will take over the market.