People need to understand that this is about tracking your eyeballs. Reddit viewed on a webpage does not provide the metadata they want. What metadata does the app provide? Things you wouldn't think about wanting as a human, but the aggregate is very valuable.
Stuff like how long did you watch that video Ad? Where did you click on screen and at what time? What content were you viewing and what course of action did you take to get there? Web viewing only shows the landing page you arrived on reddit from and the exit page that took you away from reddit. Performing these actions in the app provides metadata cookie crumbs like a trail of roach shit to every single thing you've done on reddit in micro activities.
This is the one I'm excited about. I switched from Sync to Boost and never went back as a redditor.