I somewhat disagree. The key to profitability in the audio space is moving listeners from pay-per-stream content (music) to owned content (podcasts, shows, etc.). For that latter costs are fixed even as listenership grows. The only profitable subscription audio service is SiriusXM, and they do this through exclusive licensed content (Howard Stern being the most notable example). Getting people to switch back and forth between apps makes it hard to get people to substitute the profitable content for the unprofitable.