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.
Storage Box with Borg backup can be setup to work almost identically to tarsnap.
The only real security feature missing is write-only access to the repository (Borg backup in theory supports it, but in practice it's impossible to use it in a way that prevents a compromised host from deleting it's backups - like tarsnap does).
In theory it is less reliable than tarsnap (AWS S3 compared to a single copy on a Hetzner's drive).
Storage Box is significantly cheaper for any kind of real-life backup sizes in my experience.
Borg requires more work to setup and configure compared to tarsnap. There's typically some scripting involved that's unique to your setup and I found that I had more documentation to study before I understood how to use Borg correctly.
A know a few people that have very low opinion of Borg's code quality and stay away from it because of it (I haven't studied it first hand)
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.