Since there is relatively little information on the linked page, I'll put some questions I have here.

1. How does it work? It would appear the list is user curated. New submissions are from users (via submit) and ranking is based on hearts? Is there any future plan to be able to associate # of plays with a given episode (not sure if podcast app apis allow this).

2. In relation to #1 (an asked already by others), how can I subscribe to this in my podcast app?