There is a growing Community of Streamers on Twitch and YouTube, which are playing the German Card Game Skat. Unfortunately there is no such category on Twitch. It cant be added on IGDB, cause its not a digital game.
Right now the only alternative is the category "Deutsche Kartenspiele" which translates to "german card games". But I think an own category would be realy helpful for the community to grow.
It is estimated, that in Germany alone 20-25 Million people are able to play skat with around 1600 associations all over the country.