Podcasts tend to be available from different sources to extend their reach YouTube and Spotify don't offer RSS feeds, however other services like redcirle.com, megaphone.fm, anchor.fm, and audioboom.com all offer RSS feeds. Even Apple should as it has a set of iTunes extensions for RSS to annotate things like the episode number.

I've been able to find RSS feeds for all the podcasts I listen to.

Youtube offers rss feeds, for example: https://www.youtube.com/feeds/videos.xml?channel_id=UCXuqSBl...

It's just a bit clunky to find. You need the channel id which you can find in the page source somewhere.

Note that this is a regular rss, not podcast rss.

YouTube, very surprisingly, does offer RSS feeds (for now).

Nope

Still get all of my podcasts via RSS. Several dozen.