Why put 30 at the end of the story?

Maybe it's some kind of code or internal marking for their editorial process. I'm not really sure.

It might be used as a kind of code or symbol within a particular fanfic community. Maybe it indicates a certain type of ending or theme.

Just write it simply as 'The end' in a clear and noticeable way.

It depends on the tone and theme of the story. A word like 'forever' could give a sense of timelessness if the story is about lasting love or friendship.

There could be a number of reasons. It might be that the platform you're using has some restrictions, or maybe you haven't completed the necessary setup steps to upload the story.

Sure, you can put the date on a story. It helps provide context and gives readers a better understanding of when the events took place.

Redemption. If a character has made mistakes or had a dark past, achieving redemption at the end can be a very powerful feeling. For example, a former villain who now uses their powers for good. It shows growth and the possibility of change, which is inspiring in a fantasy story. It also gives a feeling of closure as the character's arc is complete.

You can put an end to a story by creating a moment of reflection. Let the characters or the narrator look back on the events that have occurred. This could be a simple statement like 'And as she walked away, she knew that this chapter of her life was finally closed.' It gives a sense of finality.

Maybe it doesn't fit the serious and professional tone of a business story. Music could be distracting or not in line with the intended message.

Maybe it's due to copyright issues. Some music has strict usage rights and can't be added without permission.