reality can be inconvenient. Why not accept the challenge of guessing what the author will say (eg. by researching on wikipedia or Porter's competitive advantage)? It's one of the most effective learning strategies - get it right or wrong, you won't forget.

One approach is to not expect to have customer-based competitive advantage at the start, but have a plan of how to get there. Eg. a product that has network effects + a plan for how to get there.

I think the idea of enduring or sustainable competitive advantage is a bit misleading, because things always change, so competitive advantage is dynamic. It can be more helpful to in terms of the duration of a competitive advantage. For example, when you start off with an easy-to-copy product that is in demand, you do have a competitive advantage - it's just that it doesn't last long. But you can use that brief period to build the next competitive advantage. (in rock climbing, a dynamic move is when you are not statically supported, but rely on your momentum to reach a stable point).