Comment by 47282847

The system as a whole is rarely used. I think it’s a combination of poor APIs and hesitation of the population. For somebody without technical knowledge, there is no obvious difference to the private video ID companies. On the surface, you may believe that all data is transferred anyway and you have to trust providers in all cases, not that some magic makes it so third parties don’t get more than necessary.

I don’t know of any real world example that queries height, I mentioned it because it is part of the data set and privacy-preserving queries are technically possible. Age restrictions are the obvious example, but even there I am not aware of any commercial use, only for government services like tax filing or organ donor registry. Also, nobody really measures your height, you just tell them what to put there when you get the ID. Not so for birth dates, which they take from previous records going back to the birth certificate.