None of these stories are legit!
E.g., citizens of Colombia can easily legally move to other countries in their “Mercosur” common market: Brazil, Argentina, Chile, Uruguay, Paraguay, Bolivia, Ecuador, Guyana, Peru and Suriname are all easily legal new destinations for them.
https://www.quora.com/Can-citizens-of-Mercosur-countries-live-in-other-member-states-freely
Don’t spoil the sad stories with facts. Party pooper!