Also, want to add that the Tleilaxu do try and grow sand trout in other deserts in other planets to replicate the spice growth outside of Arrakis. We as Bitcoiners should appreciate that absolute scarcity is not only relegated to digital domains. And it’s science fiction, makes for more thrilling scenarios. In this one scarcity is that  sandworms seems to grow in Arrakis and due to that spice happens to be there. 

 Also I want to say that sand worms are not native to Arrakis but I could be wrong