The “motivation” section:

Many of us have multiple cloud accounts, drives that aren’t backed up and data at risk of loss. We depend on cloud services like Google Photos and iCloud, but are locked in with limited capacity and almost zero interoperability between services and operating systems. Photo albums shouldn’t be stuck in a device ecosystem, or harvested for advertising data. They should be OS agnostic, permanent and personally owned. Data we create is our legacy, that will long outlive us—open source technology is the only way to ensure we retain absolute control over the data that defines our lives, at unlimited scale.

This just sounds like a NAS with extra steps, and none of the ‘own your data’/data security (companies can kill your account at any time, for literally any or no reason at all). Grabbing your data and actually moving to a system that you truly own is the best course of action here; this is like a band-aid solution for a shotgun wound, unless I’m missing something. I guess it might make the move easier, but if you never actually cut ties from the companies holding your data… what’s the point?