There's a bunch of S3-compatible bucket stores. I suppose one could ask their user for their S3 bucket key. It should be possible for an S3-like service to prov

There's a bunch of S3-compatible bucket stores. I suppose one could ask their user for their S3 bucket key. It should be possible for an S3-like service to provide one-bucket-only keys w/ rate limits. The users knows where their data is and exactly when its being read/written. And when done using the app, the user can even revoke access. Of course, having users manage a storage bucket and its key is a bit tedious. Browsers could generate a per-app bucket and provide the bucket key to the app, all with user permission (like when a site asks for location permissions). These buckets can be shared between apps too. As long as apps can read the same data formats, data portability is stellar. It would be great to have an ecosystem of apps that all use compatible buckets/formats. But this is unlikely to happen bc this sort of transparency and data portability isn't currently a big demand by users / governments. Privacy activists have gotten a great number of wins over the past decade. We need to make progress in many more computing issues.