A charging station isn't like a full blown gas station with safety critical infrastructure and operations staffing it. A charging station is mostly a parking lot space with some electronics, a cable and some signage featuring a company logo.
The amount of "waste" amounts the the plastic used to display said logo and some rubber and copper. The actual electricity itself and the infrastructure used to deliver that electricity is already standardized and shared among not only all electric car companies, but everyone in the area period.
There could be waste in terms of duplicated effort. If Ford has charging stations that cover, e.g., the Rockies very well, it'd be "wasteful" to force Tesla to have to build out an identical network to cover the same region. (Where "force" is accomplished by incompatible cables, or communication changes, or some other issue.)
If companies can share infrastructure, then they all will benefit from each other improving their own networks. Ford adding stations that can be used by other EVs will further improve the quality of life for all EVs.
They do share infrastructure, the actual infrastructure needed to setup a charging station in the Rockies isn't in the signage and some fairly basic electronic components, it's in how you get the electricity to the Rockies. That will be shared by all car companies and isn't something the car companies themselves manage.
That said, I think that in many cases they should share space. For example on a crowded downtown street, there should be standardized charging stations that can accommodate multiple types of cars. It would be annoying to have one parking spot for Tesla, another for GM, another for Ford. But that's not a question of waste or resourcefulness and I don't think that needs a government to step in to regulate either.
Tesla's, along with pretty much all electric cars, support standardized charging as a matter of convenience to the user.
The amount of "waste" amounts the the plastic used to display said logo and some rubber and copper. The actual electricity itself and the infrastructure used to deliver that electricity is already standardized and shared among not only all electric car companies, but everyone in the area period.