The two RSS reader apps I’ve been using forever have either lagged in updates (ReadKit) or gone subscription (Unread).
Being a developer, I certainly think there are cases where monthly payments make sense (and I pay for some things that way), but a “reader” app that shows content from other sources is not it.
As a replacement solution, last week I purchased Reeder for macOS and iOS. So far I’m very happy with the polish and delightful details. Very well done.