Because I've wondered about that too. Like, right now there's a pretty big dichotomy between "purchase and play a game myself" and "watch someone else play it on youtube/twitch". But it would be interesting if there was a market for a kind of interactive guided tour, like for $10 let me play the best 4-6 hours of AC:Odyssey, and that's delivered as a mod that just trims all the fat, levels me up quickly enough to hustle through the main story beats and see the good boss encounters and action set pieces.
(Ubisoft themselves sort of do this with their paid XP boosters, but that doesn't actually cut content, it just lets you skip a few hours of grinding over what is otherwise still a 40hr+ experience for most people)