[andrepd]

Well it's been continuously sold for over a decade now, and bundled with the Switch.

[furyofantares]

It's bundled due to the success of the game and not the other way around: https://news.ycombinator.com/item?id=44338584

[mook]

Famitsu (a Japanese magazine) has top ten sales of console games in Japan every week. Until the Switch 2 launch, Mario Kart 8 was there nearly every week.