That is not true, because the natives also count for the monopoly. While I understand that in the early stages of the game route TPs cannot be fenced off to prevent abuse and allow raiding, that is not exactly the reason why walls are not allowed on the route.
I don’t want to deviate from the topic, so I leave you this thread in case you want to give your opinion.
Trade routes (Rework) 🚂🚋🚋