Are there hidden online unlocks in gta v story mode?

The verified evidence describes Grand Theft Auto Online as the multiplayer component of Grand Theft Auto V, detailing its release dates and open-world environment in San Andreas and Los Santos. However, the source contains no information about hidden unlocks or online-related content within GTA V's single-player story mode. The evidence focuses solely on GTA Online's gameplay mechanics, player capacity, and setting, without addressing any connection between online features and the story mode's progression or rewards.