Other platforms do this too like pocketcasts. I assume it's the backend distribution network identifying your IP address and inserting 'relevant' ads. I don't believe it's being added by the podcast app (though for Spotify it may be, don't know)

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vostrocity 10 hours ago | parent [-]

I use Pocket Casts all the time and have never heard an ad inserted to a podcast.

	▲	alexdias 8 hours ago \| parent [-]
		Try using it abroad in a non English speaking country. You’ll notice the ads because they won’t be in English. This happens to me on Pocket Casts every time I travel.