Is Wii Sports on Steam?

No. Wii Sports is not distributed on Steam, so there is no Steam Charts or SteamDB player count for it. Its live popularity is tracked here via Twitch viewership instead.

What platforms is Wii Sports on?

Wii Sports is available on Wii, Wii U.

When did Wii Sports release?

Wii Sports released on November 19, 2006.

Wii Sports

Nov 19, 2006SimulatorSportWii Wii U

Wii Sports — frequently asked questions

Is Wii Sports on Steam?: No. Wii Sports is not distributed on Steam, so there is no Steam Charts or SteamDB player count for it. Its live popularity is tracked here via Twitch viewership instead.
What platforms is Wii Sports on?: Wii Sports is available on Wii, Wii U.
When did Wii Sports release?: Wii Sports released on November 19, 2006.

About Wii Sports

Bowl like a pro or go for that home run... Experience Tennis, Baseball, Golf, Bowling and Boxing as you never did before. Thanks to the Wii Remote, each sport will be immediately familiar and easy to play. And, when you feel ready, challenge your friends and family: everybody will be in for some serious Wii Sports fun!

Summary via IGDB.

Wii Sports on Wikipedia

Wii Sports is a 2006 sports simulation video game developed and published by Nintendo for the Wii video game console. The game was released in North America along with the Wii on 19 November 2006, and in Japan, Australia, and Europe the following month. It was included as a pack-in game with the console in all territories except Japan and Korea, making it the first sports game included with the launch of a Nintendo system since Mario's Tennis for the Virtual Boy in 1995. The game was later released on its own as part of the Nintendo Selects collection of games.

Source: Wikipedia (text under CC BY-SA 4.0).