There's https://github.com/AboutRSS/ALL-about-RSS as well. And https://github.com/voidfiles/awesome-rss. Would be great to see the maintainers of these work together and combine them into one source.
You can see the linked list has a link to their android app Plenary at the top, and see the last commit was three years ago. Showing the same pattern.
All the "awesome-xxx" repositories seem to follow this approach, whether by accident or design. I'm sure reviewing and rejecting the expected spammy submissions will take its toll, but it always feels a little more deliberate than that when you see the recurring pattern.