The distinction is that you would never pay someone to learn how to beat the Orphan of Kos for you; the pleasure is in getting your ass kicked to the point where you throw the controller across the room, only to pick it up again a couple hours later. That's exactly the experience these Bullshit Games aren't creating.

I don't think it's true that nobody would pay to learn it. A friend made significant money as a dota tutor, and there's whole sites full of people selling tutoring time https://www.superprof.com/lessons/gaming/united-states/. Similarly, people pay for cheats/unlocks/walkthroughs.

Metafy is a big one too. But notably people are largely willing to pay if the game is played competitively. For single-player games, not so much.

That's true for a lot of players but the problem is that like any real-life skill, many players will hit a low ceiling of mastery in certain skills for whatever reason. Regardless of whether they're unwilling or unable, these low-skill players will not feel rewarded by the game. That's a problem if you're targeting a broad audience of players (which tends to be the most profitable strategy).