If they have a patreon I found something a couple of times on kemono, it wasn't up to date but it was good enough for what I wanted to check.

Using NewPipe to scape YouTube audio may snag you some ad free podcasts.

Soulseek. Also ask for the rss feed in podcast chats I'm in.

Found some on country specific private trackers. You looking for American based podcasts?

Sounds good but, that makes me think, What about Pirate podcast ? (which is distinct from, also interesting, piracy podcasts)