Sorry, I wasn't very clear with my reply. I haven't actually found an app that does this kind of thing very well, just yet. My reply was more in the line of “I wish I had an app to do this, because searching the internet takes forever”.
Some brief searching came up nowhere when I went looking a few hours ago. I did find two apps on Google Play that seemed like they might work, but both had their own blend of issues, and neither was on f-droid, unfortunately. They were "No Thanks" and "Boycott X", if you want to try them out.
Completely agree on both points. I actually use a Samsung phone, and it's been nothing but a privacy nightmare. I'm planning to switch as soon as I've saved up enough to afford it.
Yeah, Amazon is a mess. I personally avoid anything even tangentially related to them. I've noticed that they tend to be lower quality with worse privacy than the alternatives, and their only benefit is price. Even then, Audible is a ripoff on a massive scale.