A couple thoughts:
Almost 200 of 500 locations are Porsche dealers which will not generally aid long distance travel.
Walmart’s: oil and water with re: to Porsche owners/travelers.
"The Walmart charging stations are part of a broader Electrify America project to install 2,000 chargers at nearly 500 charging stations across the country by June 2019."
If you look at the map below you can see that its quite similar to Tesla's network. And why do you posit that those locations would "not aid long distance travels"? Do you have facts for this claim?
First of all I think that's not true, secondly most travels are not long distance. And when they are, these companies are installing many chargers all across Europe and USA.
Also, where did you get that 200 figure?