This sounds cool, but the other comments here are concerning. I've been considring Hetzner's Storage Box, as it's cheap and I could use just about anything to backup my stuff – although I prefer restic.
Another point from Dave2D: they rush to launch the devices now because they might become obsolete after Google's I/O and Apple's WWDC when/if they introduce on-device AI-assistants.
The goal of this project is to educate people about online privacy and security, by securing their accounts and removing unnecessary data, and inform about which information is being collected. A secondary goal would be to do this in such a manner that everyone is able to contribute to the project by updating when new information comes, add new services to reach more people.