How deep is the storyline in gta online?

The only verified evidence provided concerns Niko Bellic, a character from Grand Theft Auto IV, and does not address the narrative structure or depth of GTA Online. Because the source does not mention GTA Online, its storyline, or any related content, I cannot provide an informed assessment of its narrative depth. If you need details on GTA Online's storyline, additional reliable sources that directly discuss it would be required.