[fritz]

and real smart people, maybe they are now world-class scientists, got their bitcoins for free, just because of their intelligence

This is completely bullsh*t

Pretty creepy at first, but it's not government-owned and iris data is supposedly anonymized.

As I understand it, even if it is anonymized, it means anybody can see your wallet (depending on the anonymity they chose for the crypto) by scanning your iris.
It's an effective way to definitely link a unique wallet to a unique person, and that's dangerous and at the opposite of the ideology of most cryptos.