Lire questions

Hi! I have a few questions about the Lire RSS reader app.
1. Does it require an account?
2. In the app store description in the "in-App purchases" section there is something about tips. What are those?
3. I read from a while ago that Lire didn't have server-based feed processing, as in: if a website only shows ten articles in their feed, the rest of the articles wouldn't be visible with Lire. Is this still the case?