Wow I feel I just came out of a cave, to discover only now about Worldcoin.. Apart from the arguable concept itself, I'm genuinely wondering why betting on yet

Wow I feel I just came out of a cave, to discover only now about Worldcoin.. Apart from the arguable concept itself, I'm genuinely wondering why betting on yet another scanning device, instead of using fingerprint scan, which is now available on most smartphones ? Is it that much more reliable that it's worth going through the pain of engineering a new hardware ? Finally, how they could expect any other reactions than doubt, fear, and reject, out of this solution, while fingerprint and face detection already go through so much ethical issues ?