Sega once participated in the video game industry roughly how Nintendo does today, by producing a home console and making first-party titles for it with their established properties like Sonic the Hedgehog. Sega's consoles definitely have fans, but the company was losing money and Sega did not produce another console after the Dreamcast. Today, they do perfectly fine for themselves by making games as a third-party developer and operating other assorted media ventures like merchandising for anime. They're also a major producer of arcade games.