If you were hoping to pick up a copy of Mario & Sonic at the Olympic Games Tokyo 2020 for the Switch, your only option now is the physical route, as the game has been delisted from all digital storefronts, Nintendo eShop included.
Another One Bites the Dust
While SEGA announced that the game has been delisted, no specific reason for the removal was given. However, speculation strongly points toward licensing expirations. Many licensed sports titles, especially those tied to specific world events like the Olympics, have limited-term agreements for the use of official logos, music, and branding.