"All data, over time, approaches deleted, or public." So which one is it in this case? I think if you're offering something that isn't actually zero knowledge

"All data, over time, approaches deleted, or public." So which one is it in this case? I think if you're offering something that isn't actually zero knowledge then the way to create trust is to use something our societies have invented a long time before web apps: Legally binding contracts that give sensible privacy guarantees and support a viable business model. I fear that's the best we will ever be able to do when it comes to web apps that do more than just backup or data transfer.