To launch a multiplayer Blackjack game online as a business owner, start by partnering with experienced developers or a trusted blackjack game development company to build the game with real-time multiplayer features. Make sure the platform includes secure player management, fair gameplay, and scalable backend infrastructure. Once development is complete, deploy the game on a reliable cloud hosting service to ensure smooth performance. Finally, focus on marketing and user acquisition strategies to attract and retain players, while regularly updating the game based on player feedback to grow your user base and revenue.