The move is, without a doubt, a setback for Pandora. Questlove Supreme was the biggest original on Pandora's podcast slate. The musician was also an advisor to Pandora and the company's first artist ambassador. More than anything, however, Questlove's move to iHeart speaks to just how big of a business podcasts have become. During its most recent quarterly earnings report, iHeart said it was able to increase digital revenue by 33 percent thanks to a 300 percent in podcast listenership. With that kind of money at stake, creators like Questlove are going to be in high demand.