Not really concerned with how Coca Cola makes their money. It's about the host who might be concerned with ad revenue loss if enough people use our clean feeds to make a dent in their listener metrics.
That's a naive way of thinking. If Coca Cola see their sales are not going up ("ads are not effective"), they'll stop sponsoring podcasts, leading you to do less work, leading to people stopping to use your product.
And since you intend to make money out of this, you'll have strong incentive to keep this charade going. :)
Who's we? Nobody makes things for charity. Even you, who built something out of passion, is charging users for the product. You're here 'advertising' and spreading the word.
It is marketing, and it is the same thing that Coca Cola and others are doing as well. No need to get all judgemental.