Wii Sports enjoyed a similar status, as it was also bundled with a console. I don't think console bundles are necessarily a fair way to count video game sales.
Mario Kart was not originally bundled with the Switch and the Switch has never been exclusively bundled with Mario Kart. You've always been able to buy a Switch by itself or bundled with other games - Mario Kart was not even the first bundle. It was like the 8th or something - two years after release, and has been re-issued every Black Friday since, but there have been numerous other bundles since as well.