This sounds great but practically where hard to follow and RoI compared to Web will still be less. First, niche audience is not sticky on mobile. In the ideal world, yes everyone wanted it but it didn’t work. Niche audience for even many media houses didn’t work. E.g. every publisher wanted to launch their own youtube, didn’t work. Every publisher wanted to launch it’s dedicated app, it didn’t work. If one can really find, dedicated 1000 people, then yes. But how long they stay, how many times they open your app, how many times they interact with your app, this funnel goes down and down, with single digit conversion rate at each step of the funnel.