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Here's a description of what we've done to solve that problem: https://www.airbornos.com/docs/security
That's interesting, but you're plugging holes in a waterfall I think. For example, that first visit which installs the service worker can already deliver bad code. Not saying you will do it, but it all relies on people trusting you not to do it. So statements like "we CAN'T read your stuff" are not true on the web. Luckily, most web users don't care about being hacked by the server - they care about owning their own…
Yes, but that is also the case when you install a desktop app. That's why Airborn OS is open source, so that you can inspect the code.