But it's associated with Mario. Whether you look at mainline Mario games, or his many spin-offs, he gets more games per platform than any Nintendo IP. Only Pokémon comes closes or exceeds the number of games.
However, maybe Nintendo indeed would prefer 1 game per platform for a spin-off like this. Nintendo is insanely protective of their IP, and Mario+Rabbids is a very rare third-party game with Nintendo IPs.
Lifetime Sales Predictions
Switch: 161 million (was 73 million, then 96 million, then 113 million, then 125 million, then 144 million, then 151 million, then 156 million)
PS5: 115 million (was 105 million) Xbox Series S/X: 48 million (was 60 million, then 67 million, then 57 million)
PS4: 120 mil (was 100 then 130 million, then 122 million) Xbox One: 51 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima