The largest business case for skill-based gaming is likely machines designed to skirt local laws on gambling. I remember seeing some machines where you had to 'nudge' the reels in a certain direction to get the payout. Of course it was very obvious which direction to nudge them but this was called 'skill'.
I subscribed to some used slot facebook groups out of curiosity. There was a vendor today that posted selling 'skill based games' that were supposedly legal. I was going to post the link but i couldn't tell if my FB account was somehow embedded in the URL it gave me so I didn't.
In my part of the world low-end bars are being taken over by these slots. I stopped at one recently because I thought it was an old bar that opened up. Was with my dad and wanted to have a couple of beers with him. Go inside to find out you can't buy beers but you get them free if you buyin to the machines. I should have just done that but instead we went down the road to a real bar.. which also had a dozen modern looking slot machines lining the walls. Go into the city proper and the municipal police crack down on these things.