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Most people don't care about their data. They don't even understand what companies do and do not collect. They want convenience.

Nonetheless, there are apps that don't collect data or allow you to sync to your own backend (usually to WebDAV).

Some links to get you started:

- https://github.com/awesome-selfhosted/awesome-selfhosted

- https://news.ycombinator.com/item?id=26365835