Podcasting is growing (slowly) and offers a great opportunity for brand engagement. Generally free, the idea is to be where the audience already is, and have a reliable host for content and the rss feed.
Media and RSS Hosting
Google Podcasts and Google Play Music Podcasts
Note, these are two different things:
Pocket Casts (#4 platform
Stitcher (#3 platform)
Spotify (#2 platform)
iTunes/Apple Music (#1 platform)
Note that once in iTunes, then available in a few days to the Overcast player/app (with generated URL).