Maybe than you can also make some registration fee over the registration wich makes it for low level scammers not interesting to do so.
But keep it low enough to normal investors to get there recommendation on the list.
Also there can be a record of scam ICO's on the list which do not have all the thrusted necessery requirements for an ICO.
And ofcourse full proof of exitence by the regulated paperwork.

It's just a idea..

But it has to be globely....i think