It's interesting to think about gacha mechanics in a purely narrative context, because it's such a video game thing. But serialized fiction platforms, especially apps for serialized webnovels, absolutely use similar hooks. The role is pure dopamine-driven engagement, I think. You don't know what's behind the next 'pull'—will the next chapter unlock a spicy scene, a major plot twist, or a beloved side character's POV? Apps that let you spend 'tokens' to unlock 'premium' chapters feel exactly like a gacha pull. The story becomes fragmented into randomized or tiered rewards.
This can totally warp the storytelling. Authors might feel pressured to end every chapter on a massive cliffhanger or reveal to incentivize the 'pull', which leads to exhausting, repetitive pacing. The plot can start feeling like a slot machine payout schedule rather than a coherent narrative. I've dropped stories where it became obvious the author was just stringing along shocking moments without any real character development, all to keep those 'energy' or 'coin' payments flowing. The system itself becomes a character, an antagonist almost, holding the story hostage.