Also note, @worhui@lemmy.world, this labelling is only a Switch 2 thing. I believe it's up to the developer how they want to give the warning on Switch 1 cases, if they even need to at all (either way, the labelling varies game-by-game on Switch 1). But for Switch 2 games, it's a requirement, and is always at the bottom of the game art.
Edit: Overhauled 2nd sentence to clear up potential misunderstanding.