It just needs to be described in a more concrete way to people. Such as, You know how the podcasts you listen to keep getting updated on your phone? That's RSS. Imagine if other things you liked turned up when they were new and you had a lot of control over that process.
Most non-tech people I know listen to podcasts through Spotify and some think Spotify invented them.
Looking how podcasts advertise themselves, those who do use RSS advertise "Apple Podcasts or in your favorite podcast app" here.
It's been the absolute worst thing for 10+ years that some podcasts have adverts, even their own website, but somehow fail to provide the RSS feed link anywhere - only app specific links for the biggest 2.
You also have people producing "podcasts" that only exist on youtube.