App Idea: Location History - eviltoast

I like the fact that my Android phone records my location timeline from Google Maps, but the fact that this is stored in Google servers creeps me out.

I know you can download the entire location history database from Google so I was planning on building a custom app to store and browse this data.

I was also curious if there would be the possibility of making the phone send locations to this app instead of Google, but I don’t know much about Android and I don’t know if this would be possible.

What do you think about it? Is there already an app like this? Do you think this is a good idea?