Tower Collector is an app to help contribute mobile tower data to Mozilla Location Services and OpenCellID, so that its open to all instead of a few large companies. Both of them are open source projects.
This data can be used for estimating location without GPS for example.
Fdroid link
Yeah, this is kind of what left me on the fence on whether to contribute or not to OSM. You have to create an account to contribute, and AFAIK contribution authorship is public in OSM. And if I were to contribute, I'd probably do a lot of contributuions related to my living place's surroundings, which means that, if my OSM account were ever to be associated with any of my other facets on the Internet, I would get doxxed in the easiest way possible.