Apple, Google. Two app stores that are basically necessary for existing in the modern world with a smartphone, which include apps covering Japanese government services.

In the gaming space, you’ve got PlayStation Store, Xbox Store, Nintendo eShop, Steam, Epic Game Store, GOG, a bazillion publisher storefronts, Apple and Google (again), Itch.io, physical media for the big 3 consoles at dozens of brick and mortar retailers, or even installing games directly with no store at all (Minecraft originated from its own online purchase portal).