Hi sim6.
Your attention to open culture meets mine. As I wrote in my pres., I’m using mainly F-Droid apps (“F” stands for “Free” in an OpenSource mind). When installing a new F-Droid app, I appreciate the system warns me about data collection by the selected app. So I can easily decide to go or cancel the installation.
To make your own opinion, have a look to: https://f-droid.org/, …maybe it will suit your needs.
This topic too would be helpfull.