> The reason the app store is full of freemium apps stuffed with ads and microtransactions is because that's overwhelmingly the thing that consumers choose, and what makes the most money.
No, it's because Apple threw the App Store together very quickly (after realizing that the "sweet solution" of web apps wasn't going to fly), and in order to accelerate this process they directly cloned the iTunes Music Store in almost every way. This turned out to be a complete disaster and resulted in a race to the bottom, because the music store was designed to sell 99 cent songs, not software that may have traditionally been $99, or at least $29.
One of the best ways to get visibility is to be in the "top charts", which makes a kind of sense for music, because all singles and all albums are more or less the same price, but to get into the top charts for software you've got to optimize for volume rather than price.
In so many ways, trying to sell apps like songs completely destroyed the software market. Indeed, it wasn't great for the music market either. Apple convinced the music publishers to unbundle albums and resulted in a race to the bottom there too. Musicians need the money from album sales; very few can "make it up in volume" with just hit singles.
> Even desktop, a market that has historically used the up-front model is starting to switch to the "freemium or SaaS" model.
Only because of the downward pressure from the mobile market.