Steam takes a 30% cut of all sales. If a game sells over $10 million then the cut is reduced to 25%
There is Epic Game Store: maker of Fortnite and Unreal Engine which also gives away 1 or 2 free games a week. It takes a 12% cut from developers selling through their store. Tencent, which has close ties to CCP, owns ~40% of Epic.
GOG “good old gamestore”owned by CD Projekt Red, the developers of the Witcher and Cyberpunk 2077. Takes a 30% cut from sales. Also advocates for games without DRM.