I can't imagine that any app that currently exists gives a shit about exploiting your data. Lemmy is too young for that to really be a problem.

The real problem is that nothing on lemmy is private because of it's federated design. There have been some discussions the last few weeks talking about this, but just about every interaction you do is broadcasted out to every instance, and its social media so of course anyone can see what you post. Things like viewed posts and saved content should stay on your instances server, but assume every other action is public.

I just use jerboa it's foss.

I use Eternity

I would recommend any of the open source apps, my personal recommendation is Eternity.

https://codeberg.org/Bazsalanszky/Eternity

You can find it on f-droid.

Voyager is on both platforms, Jebora is only for Android, both are pure open source so you have full privacy and anonymity.

I would stick with one of the open source apps. Thunder is my favorite, but Voyager and Eternity are good as well.

You could use the website in a webbrowser. Then you don't have to be concerned about app and app provider.

Just don't use anything proprietary like Sync or Connect

I use Eternity it's foss and a fork of infinity for reddit

Sync is the absolute best app but I think privacy is probably not great.

But this is Lemmy so you don't even need to use an email address if you don't want. You can be semi anonymous and change username often if you want, and change between apps or instances also.

Data is never gone but it's also not tied to anything real about you.

I use Connect for lemmy. Doesn't ask for any permissions.

Liftoff

Liftoff is pretty decent

This is all opinions here, so I'm just saying that Sync is the only one I know that's closed source.