Well, as said, my criticism comes from half a privacy angle, but mostly from the technical/execution angle. Their prototype leaves so many basic (and hard!) qu

Well, as said, my criticism comes from half a privacy angle, but mostly from the technical/execution angle. Their prototype leaves so many basic (and hard!) questions unanswered that, to me, their architecture smells less like a conscious decision and more like a strong case of: "If all you have is a hammer then everything starts to look like a thumb." In all honesty it looks like a non-starter to me. Sure, "just start hacking" is what everyone tells young startups to do, and that's what they apparently did. But that approach doesn't work very well for building a distributed system where all the components absolutely must snap into one another if you don't want the whole thing to fall apart under stress. Much less if your stated goals include terms like "privacy" and "security". The old proverb "Weeks of coding can save you hours of planning" does not apply here, at all.