It seems like nano has started to reach vi-like levels of ubiquity. Every fresh Debian install annoys me by dropping me into nano as the default editor at some point (until I update-alternatives and point it at vim.tiny).

The edge still goes to vi, especially if you log into older/legacy things, or in very resource constricted environments. It looks like busybox, for instance, has a vi but not a nano: https://busybox.net/BusyBox.html