I really like the Personal Data Store concept. You own your data, and you choose to let apps interact with it for your benefit. It's pretty much what the #indieweb is doing (though perhaps for the more limited subset of things that don't need verified claims).
I don't like the commercial nature of most PDS offerings (including Solid now).
Either way, some good general food for thought in this article.
https://medium.com/@shevski/how-solid-is-tims-plan-to-redecentralize-the-web-b163ba78e835