when i use either of my podcast apps, it fetches an mp3 file (or streams it) and there's no additional ads (read this as "no additional non-native ads") that "change" when i listen again in a year. This means the podcasts that i listen to, i suppose, are not hosted on hosting platforms that inject ads. Because, as i think needs to be reiterated, podcasts are just mp3 files. you can host them with caddy, or nginx, or apache, all pointing at some file(s) in ./www/html/mp3/ One does not need to host it on "Acast" or other "podcast hosting providers", a podcast is just an mp3 file, which can be automatically fetched by anything that can download both rss and mp3 formatted files.
at a certain point, one has to ask themselves if whatever media they're ingesting is worth the scum.