It's possible it's just a count of how many podcasts are included in the "Discover" section. I don't know what the process for getting added to that is.
It covers almost all of the "big" podcasts, but there are a handful of local ones I've had to add manually.
PocketCasts is interesting because arguably the Discover section is less central than other apps (I can't remember the last time I used except to do searches for new shows vs. other apps where the main page is loaded for recommendations of shows I don't care about).
It covers almost all of the "big" podcasts, but there are a handful of local ones I've had to add manually.