The iHeart radio podcast company creates podcast enshittification with A.J. Jacobs very nice podcast The Puzzler. Of the 14 minutes a podcast lasts, 5 minutes are filled with ads, that is 35%.

Yes, Tim Ferriss, arguably the best podcaster out there, preambles and postambles his podcasts with 5 minutes of ads; also annoying, but at least his podcasts are between 1 and 2 hours long!