Yes there is. If I can emulate Super Mario Odyssey on my PC, I don't need to buy a Nintendo Switch. If it wasn't available there, I'd have to buy a Nintendo Switch to play it. That's a lost sale for Nintendo. You could argue that I wasn't going to buy a switch anyway, but then we're getting too into hypotheticals.
This is the same reasoning the music and movie industries use when they go after people downloading music. And contrary to the popular opinion, I think it is wrong: if people want to pay, they will pay. Same for movies: if people would really want to pay for a movie, they would go to a cinema. Or stream it after a week or two. But there are also people who would jump through hoops than pay for music or movies. And that is not a lost sale because there was never an intention to buy something in the first place.
