Most apps have a privacy policy because they need one. Data is flowing somewhere: to a server, to an analytics service, to a crash reporter. The policy is how they account for it.
Slow Web's is short because there isn't much flowing.
I don't track which articles you open or how long you spend reading. There's no server that knows what you read. There's no third-party SDK quietly doing it instead.
The only request that leaves your device is the one that fetches an RSS feed. The same request any RSS reader makes. The response comes back. Nothing about you goes with it.
For me, privacy isn't a setting you have to find and turn on. It's the absence of the mechanism that would require the setting. An account creates a data model. Remove the account, and the model doesn't exist.