I think most podcasts post the exact same episodes to all popular platforms. Some may have an ad-free version on Patreon. With Spotify, it's sort of similar to

I think most podcasts post the exact same episodes to all popular platforms. Some may have an ad-free version on Patreon. With Spotify, it's sort of similar to when the paid YouTube (Red/Premium) became a thing. Yea, you'd get rid of the Google-picked ads, but the in-video sponsored ads added by the video creator would still obviously remain.