Why does gta online receive updates but not gta v story mode?

GTA Online operates as a live-service multiplayer game that launched in 2013 as the online component of GTA V. As an online service, it was built from the ground up to receive regular content updates, including new missions, vehicles, game modes, and events. This model keeps players engaged over time and provides ongoing value to the multiplayer community. In contrast, GTA V's story mode is a single-player narrative experience with a definitive ending. Once Rockstar completed the main story, there was no narrative need for additional content, and the single-player format doesn't support the same live-service update model that works for multiplayer games. The technical infrastructure and business model for GTA Online are fundamentally different from the single-player story mode, making regular updates a core feature of the online service but unnecessary for the completed story campaign.