Economic moat

A moat is any lasting advantage that makes it hard for competitors to take customers or profits away: a brand people ask for by name, technology nobody else can build, a network that grows more useful with every user, or high costs of switching to a rival.

Every breakdown has a slide asking “Why nobody can just copy it”. Moats can also shrink: technology changes, patents expire, tastes move on. That's what the risks slide is for.