It's a tech demo that costs 50 bucks but should have been a pack in. Not to mention it isn't that fun...or quality..or good. But hey, different strokes. I personally don't think it needs to be advertised. Even shitty games sell well.
1-2 Switch is a game that's only really useful in a party setting. It's not the kind of game you can just bust out any time your with a friend, there has to be a crowd involved. It's something mainly makes sense in Japan, which is why the game still gets advertised there. Besides, 1-2 Switch isn't a pack-in because it doesn't actually explain what the Switch is on a broad conceptual level like Wii Sports did with the Wii.