There are a few predictable reasons scans end up circulating. Sometimes it’s community sharing—someone posts “here’s a page” because a child wants a specific character right now. Other times it’s convenience: printing a page can be faster than ordering a physical copy or waiting for shipping.
Another driver is partial discovery. A user may find only one page they like from a preview, then searches for “elf days coloring book scans” to fill in the rest. That search behavior fuels more uploads, and the loop becomes self-sustaining.
Still, the practical reality is that scans change the relationship between creators, publishers, and readers. When a full set of pages is shared, it can reduce sales of legitimate editions—especially for smaller publishers and niche titles where revenue matters.