Traditionally, security and economics functionalities in IT financial services and protocols (FinTech) have been perceived as separate objectives. We argue that keeping them separate is a bad idea for FinTech “Decentralized Autonomous Organizations” (DAOs). In fact, security and economics are one for DAOs: we show that the failure of a security property, e.g. anonymity, can destroy a DAOs because economic attacks can be tailgated to security attacks. This is illustrated by the examples of “TheDAO” (built on the Ethereum platform) and the DAOed version of a Futures Exchange. We claim that security and economics vulnerabilities, which we named seconomics vulnerabilities, are indeed new “beasts” to be reckoned with.