He'll just end up selling this to governments as an extra biometric check that they'll link to their new digital ID systems. No different to passport photos or fingerprints, just a bit creepier.
Focus is on poor countries with bad infrastructure, so he will magically get aid money to pay for the rollout.
It's just a grift dressed up as cutting edge tech "making the world a better place" (💯 this is perceived positively by the Davos crowd, and global South bureaucrat hangers on).