Comment by simonw

That's always been the biggest flaw in the Worldcoin idea in my opinion: if you have a billion+ humans get their eyeball scanned in exchange for some kind of cryptographic identity, you can guarantee that a VERY sizable portion of those billion people will happily sell that cryptographic identity (which they don't understand the value of) to anyone who offers them some money.

As far as I can tell the owner of the original iris can later invalidate an ID that they've sold, but if you buy an ID from someone who isn't strongly technically literate you can probably extract a bunch of value from it anyway.