Well, 'unliking' a story often implies a change in one's perception. Maybe at first, a user thought the story was interesting and liked it, but later, for various reasons such as finding out new information that made the story less appealing or simply changing their taste, they might choose to 'unlike' it. It's a way to manage one's digital footprint regarding the stories they interact with on platforms.
The idea of 'unliking' a story is mainly a user - driven action within digital platforms. It can be a simple click to reverse a previous like. It could be due to the story being inaccurate, offensive, or just not as engaging as it first seemed. This action helps users curate their experience and also gives feedback to the content creator about the quality or acceptability of their story.