F-Droid is possible but we're currently using google services for location tracking, so it's not possible to publish there due to that. And we also have a LOT of work ahead of us, so it's not a priority
Before building Dawarich, I naturally extracted my data via Google Takeout and my mind was blown same as yours when I realized just HOW MUCH they know about me even when we're talking location only. It was a big incentive for me to take control over my data, or, at least, to ALSO have it, same as many-many cloud provides and apps have.
There is an unofficial app mentioned in the post, it should be soon available on f-droid :)