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EFF has a good write-up about zero-knowledge:
https://www.eff.org/deeplinks/2025/07/zero-knowledge-proofs-...
> What ZKPs don’t do is mitigate verifier abuse or limit their requests, such as over-asking for information they don’t need or limiting the number of times they request your age over time. They don’t prevent websites or applications from collecting other kinds of observable personally identifiable information like your IP address or other device information while interacting with them.

In the past few years, governments across the world have rolled out digital identification options, and now there are efforts encouraging online companies to implement identity and age verification requirements with digital ID in mind. This blog is the first in this short series that will explain...