The currency itself is anonymous and decentralised, so their members being behind the curtain would be legit too. But it's not that difficult, if someone needs to find any, they have the scope under some procedures.
It was in 2016 - 2017 when no one needs the details about the developers but as today you can see lot of scams happening so ICO needs to disclose all details about them if they are genuinely developing the real projects.