An unalterable bipmetric marker used in locking systems already on the field and people sign up in mass to give the information away in exchange for some crypto token. Why not just ask people for their password lists and be done with it? They say sign up for it and the original scan is deleted, that doesn't matter though when the hash representation of it is tied to a person. Just wait until this kind of thing becomes standard practice in the maternity wards of hospitals...
Reminds me of the movie "I origins" (the maternity ward part). If you haven't seen it, it's one of my all time favorites - and better to be watched without knowing what it's all about, too easy to spoiler.
Great. Big Tech has our pictures, our memories, our families and relationships, our likes, dislikes, basically everything to do with our identities. The Government has our fingerprints. Cameras and our own phones record our every movement, action, and/or spoken word. An iris was one of the few pieces of information that wasn't available to you. Now you want it too. Sincerely, fuck you.
TikTok already started capturing people's irises awhile ago. That's why all of those eye tracking filters became available, to get the data they needed.