[deleted] I use Infinity. I think its ons of the best options for viewing reddit on mobile.
In terms of trusting that the app isn't 'spying on you', here is their privacy policy: https://docile-alligator.github.io/ .
Of course you have to trust that they are abiding by what they put there.
However, the app is open source which makes it much more transparent.
Of course there is no guarantee the apk on Github or on the Play Store is actually the code on github, they could sneak other stuff into the app they compile.
So you could build the app yourself from the code on Github...
It goes on and on but you do have to trust some apps and services at some point. Also apps are, in some ways, safer than using a service through a browser as the apps are restricted by the permissions they are given whereas browser code can change at any point and its harder to verify what code is running through a browser. That is up for debate though I'm sure, and I'm not qualified to get into that argument.
Infinity doesn't ask for too many permissions and the dev seems trustworthy to me. Personally I think it's a pretty safe bet it isn't spying on you. One thing you can do though is set the battery use to restricted for Infinity, then it won't be able to run in the background much. Also, you can deny the sensors permission. Those things will reduce its ability to 'spy' if it did want to