Tesla pushes people to charge at home and only use the Tesla infrastructure while on road trips. They can use other quick charging networks, but an expensive adapter is needed. It is my understanding big city metro areas down south have some decent quickcharging infrastructure so limited range vehicles like the Leaf can move about. It seems to me when longer range vehicles like the BOLT are the norm they will need to put in new charging locations. The older locations would eventually phase out do to lack of use.
There are some in rest stops. Which is odd, since the charging time is so long.