The Podcast Index has an ActivityPub implementation, and now I can follow some of my more irreverent non-techie podcasts directly on the fediverse. So cool! Hopefully they'll add a Follow button soon...but in the meantime:
1) Find your podcast on the site
2) Grab the numeric value at the end of the url
3) Search for the podcast with this name `{numericValue}@ap.podcastindex.org`
Podcastindex.org
The Podcast Index is here to preserve, protect and extend the open, independent podcasting ecosystem.podcastindex.org