Biometric security will be very interesting for all users who want to be sure of the safety of their accounts. I am sure that this method is the most reliable of the offered options on the market of ICO projects.
Of course, the developers chose a good way to protect all their supporters. I think this suggests that the team is working very well on their project.
Pretty obvious. As we can see here, they were holding an ICO to raise fund so that the project can stay longer than ever. The supporters are anonymous, how can they protect?
I am certainly not an expert in the technical details of biometric protection, but I think that developers will be able to guarantee it. The Gigzi Iris diaphragm scanning hardware device has this capability. But you can learn the details of this device from the developers to be sure of the reliability of such a device with anonymity.