We fear and perceive the loss of what we currently have more than we fear and perceive missed opportunities of the same or grater value. It is better to not lose $5 than to find $5. If we compare losing and stumbling upon $20 bill. Losing will be more negative experience than finding will be positive.
It's easier to click to make a photo than delete it.
Collections and loss aversion. In case when you save podcast, movies, articles, photos in an online collection. It is easier to save than to delete. Likewise it is probably also easier to make yourself not save in the first place than to decide to delete it later.
Loss aversion in practice: A Deleting method. When you want to delete things quickly from a collection. Don't try to delete things that you don't want. Instead select the things you want and batch delete all the other.
Related: Prospect theory (which won Daniel Kahneman Amos Tversky the Nobel prize)