Why wouldn't I trust a vibe coded app that has existed for 1 week with all my important data?
SpaceDrive might offer a more comprehensive and better-maintained version of this, though it is not primarily advertised for this kind of use.
Why wouldn't I trust a SaaS app that is charging me and selling my important data?
...most of the software industry is one rung above back alley smack dealer when it comes to the kind of business they run.
Most software developers are bartering for food and shelter. They're not curing cancer or building an essential new bridge for a community.
Because you can self-host it all and validate the source yourself!
In fairness, you can also have that experience with Microsoft OneDrive.