I've been thinking about building a service that makes it easy to self host apps like this. I'm curious if you'd find it useful.

It would host webapps like yours that use in browser sqlite to store data, then the service provide a sync their sqlite data across different devices. The user not the app would pay for the storage of the data, so they would own their data. And you can use CSP to lock down the app from sharing with other domains, meaning an app can't leak your data.

The service would handle identity (only you can access your sqlite data - the app just ) and could provide an app store like experience with different apps of this type.

Sort of like a firebase style backend as a service, but the user would own the data instead of the app.