All that you need to know is that I am above 18 years of age.
You don't need to know how old I am, what my birthday is, what state I was born in, my gender, or when my passport expires.
The downside with ZK cryptography is the complexity. Something would have to be insanely inconvenient to justify it.
The last ~third of the article is about the EU's zero-knowledge approach
I’m just afraid that membership countries will be too dumb to understand the difference, and for the population worldwide to be able to comprehend that it’s even possible. To be honest, ZK crypto is one hell of a party trick. Compared to tech where the premise is “we put a picture of your passport in a box, and when people want to know, we look and confirm.”
They've standardized two systems under the banner of "zero knowledge". One is actually zero knowledge. The other is trust-me snake oil. Guess which one is getting deployment.