I think the focus on mobile is due to the fact that very few people would choose to make a fun game on mobile unless they were deliberately chasing money. Indie devs don’t want to use and make customers use an inferior device with more hoops to jump through. Publishing for PC is easy, publishing for Console has a higher bar to clear for quality. Publishing for mobile is more difficult than PC and makes it more difficult to build a quality game, so the majority of mobile games are unrewarding trash so the only incentive to make them is pure monetization.