I definitely think that cryptpad.fr doesn't know the meaning. Keybase's entire purpose is to make a public database of people. They know who you are, therefore

I definitely think that cryptpad.fr doesn't know the meaning. Keybase's entire purpose is to make a public database of people. They know who you are, therefore, they have some knowledge. Not that complicated. If you store user profile data and therefore link the data they store to that profile, it is not zero knowledge. Arguably, if you have to charge money for a service, you might need a way to do that, but then you're not zero knowledge. Or you just a flat rate with unlimited of whatever your service provides. I don't think it makes a lot of sense to trust a company that claims to be secure when they don't understand even the terminology, let along the complexities, of providing security and privacy.