I don't think I've encountered any super simple appliance I can plug into my home network and move data onto and then easily give online services I trust access to its data. Ever since I heard about Tim Berners Lee's new project, the Solid POD (Personal Online Datastore), I've been thinking about how to make it friendly enough to people that they'd actually use it in large enough numbers to gain traction. It always seemed like people would have to learn to start paying at least a little money to make privacy work without advertising dollars. I just Googled around for the latest and noticed that the MeWe social network (which emphasizes privacy) which Tim is working with offers a free tier on data but then charges above 8 GB. I wonder if their long game on being sustainable is to just make money on add-ons above the free tier. Here's hoping it catches on...
https://mewe.com/faq