What is the benefit of setting up the server that are not in Tokyo server?

Tokyo server is our shared region server, meaning there are a lot of customers that are sharing the same server. We recommend our customer to start in the region where their end users are located for better performance reason.
Another use case of moving to a different region is security. Many of our customers that do not want their chat data to be mixed in the same server asked us to move them into a dedicated/sole server.