This is a natural, logical, and surely profitable extension of their business. Say what you will about Elon (and I'm no fan), but his charging infrastructure and the simplicity of using it are light years beyond anyone else's. VW only built ChargeAmerica because they were forced to by DieselGate. No one else has built anything. From the videos I see on YouTube, charging at anyone else's station is a joke compared to Tesla.
I hope they take over and own this market of chargers. It would be a big step toward getting electrification everywhere.