Erm, podcasts very much get dynamically placed locally-relevant ads based on listener location (probably IP) by now. Which even makes sense, some ads are not legal to run for listeners in other countries, so as long as you conduct business there (say the BBC's podcasts when listened to from Germany) then they got to abide by local advertising laws and hence need to partially present other ads. And would want to, as not all products of theirs are available in all countries equally (as some are local in their content) and hence they have no reason to run cross-selling ads.

You actually see (hear?) this a lot nowadays. Sure, it doesn't work with all platforms and definitely not with all providers, but "tracking" for ad-purposes exists in podcasts. For legal reasons, if nothing else.