Warner Bros. was worried Mortal Kombat 11 would be too mature for Switch

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Witcher 3, another M-rated title, saw "excellent sales" according to CD Projekt Red:

https://www.theouterhaven.net/2020/09/the-witcher-3-had-excellent-sales-on-nintendo-switch/

Nintendo gamers have no qualms about buying "mature" content, so long as the game itself is a worthwhile product.