Nitro: Stream Racing is a party racing game by Captain.tv, primarily focusing on Twitch integration and community-driven play. While it is niche, it's known within streaming communities, often played during live Twitch streams for audience engagement. Such games typically have a modest but steady userbase, mostly tied to streamer activity, likely amounting to a few thousand daily active players. It lacks the persistent world and scale required to be classified as an MMO.