Awesome comment and I fully agree with you on privacy. I've read about zkp in the past but not much about it connected to identity, although I'm sure it may be worked on in some ways. It's one of those things I've been hoping would get developed by the time my more important projects are on their way to being launched. I spend way too much of my time on hive unfortunately as there's so much to do here to research what else is going on outside of the space.
For quite a long time we've been fighting off one or a couple abusers trying to multi account our POSH project for instance, they either keep creating new hive accounts or use old ones that have been inactive for a long time or then create new reddit accounts as well trying all methods to earn more than others on limited voting power we can give. Either way, for this a service that can prove you're unique without storing important data would be quite valuable and I'm sure many other ones too.
Unfortunately, I still haven't had the time to research POSH properly. But as far as I understand it, you share your hive link on Reddit and get POSH tokens in return. I don't yet understand how you can abuse this system, but as long as the links get views, that's fine or am I getting something fundamentally wrong?