And (probably not only) on Google Play, these labels are often nothing but a farce – see e.g. foundation.mozilla.org/de/camp… (TL;DR: those data are provided by the app authors/vendors voluntarily – and they are often not really "interested" in making them public; Google does not verify them but even explicitly states it's not their responisbility). 🤷‍♂️

So on Android, there are (basically) two kind of sources: the intransparent Play Store – and #FDroid 👆

False and Misleading Loopholes in Google’s Data Safety Labels

Mozilla researchers find discrepancies between Google Play Store’s Data Safety labels and privacy policies of nearly 80 percent of the reviewed apps.

^{Mozilla Foundation}