Yes it can. This (among many other reasons) is why privacy matters. Even if you have noting to hide today, law can change and now data that is collected can be used against you.
Yeah, the lack of regulation is eroding trust in technology. This kind of tracking does not require the data to ever leave your phone and under sane privacy laws, users would not be left wondering about this.
What about the business case of selling this data?? What about the rights of those poor businesses? /s
Log28: https://github.com/wildeyedskies/log28 (https://f-droid.org/en/packages/com.log28/)
Drip: https://bloodyhealth.gitlab.io (https://f-droid.org/fr/packages/com.drip/) with iOS version in development
Periodical: https://arnowelzel.de/en/projects/periodical (https://f-droid.org/packages/de.arnowelzel.android.periodical/)
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