because it's about ad money and maybe paying to promote a podcast (idk. if that is a thing)
white noise content is the best example of "user most likely doesn't active listen" so an ad on it isn't worth much
for other podcasts you would assume people listen (through yes they might not, but Spotify has no practical way of knowing that), so ads are worth more
Additionally the ad industry values that their ad is associated with "premium content" (whatever that means) and while white noise is "highly valuable for the consumer needing it" it's not "premium content" as it doesn't has much content. I mean it's literally noise, well fine tuned noise you could call art, but still noise. So highly valuable but not premium.
white noise content is the best example of "user most likely doesn't active listen" so an ad on it isn't worth much
for other podcasts you would assume people listen (through yes they might not, but Spotify has no practical way of knowing that), so ads are worth more
Additionally the ad industry values that their ad is associated with "premium content" (whatever that means) and while white noise is "highly valuable for the consumer needing it" it's not "premium content" as it doesn't has much content. I mean it's literally noise, well fine tuned noise you could call art, but still noise. So highly valuable but not premium.