Having more demand for the network means the network can grow and expand at a much faster rate and make it cheaper. That's good for Tesla drivers in the long term. And Tesla itself. Tesla making more $$ also filters back to the consumers through R&D and new products.

If EV is truly going to be everywhere then charging needs to be generic and everywhere like today's gas stations. Currently it's still very much a luxury type thing when you consider a lower-middle class person living in a skyscraper in a city (which is a ton of people these days). In urban areas you don't have the luxury of multiple separate gas station services, given the limited real estate. Having to drive longer distances to use one near your apartment for ex. The more the better.

The network was always going to become a commodity anyway. Why not establish yourself as the leader ahead of time?