If your goal is privacy/avoid tracking then you should be using GrapheneOS

AntennaPod is great, I used it for years. I eventually switched to self hosting AudioBookShelf which does audiobooks, ebooks, and podcasts. One main reason was because podcasts more and more yank the old episodes and put them behind a patreon. AudioBookShelf downloads the episodes to your server so you always have them. About 5 months after starting using it another one of my podcasts pulled that stunt and I was super happy to have all of the old episodes still.