The question is why so many of these fast chargers are in fueling stations. In the short and medium term, restaurants near an Interstate will easily make their investment back by having a couple level 2 chargers in the further area of the parking lot.
I don't think so. If you're traveling on an interstate and stopping at a restaurant, you're probably traveling long distance, in which case L2 is too slow. You need to be able to add 200-300 miles of range in less than an hour when road-tripping. Restaurants near interstates should have L3 chargers.
L2 chargers make sense at locations where cars are parked for hours, or perhaps at locations where consumers will find it nice to add a handful of miles of range, just as a convenience. So hotels, where cars park overnight, or at businesses that deploy them for employee use, or for customers where the customers typically spend hours. Grocery stores, etc., might deploy them just as a nice bonus for customers, but realistically it's rare that anyone will spend enough time at them to really make a big difference.
BTW, there are also cases where public L1 chargers make sense, in cases where cars are parked for days. Airport long-term parking is an obvious example.
But restaurants near interstates should put in L3 chargers if they want to attract people passing through. Or, alternatively, restauranteurs should find a big charging station and build a restaurant next to it.
The blue Interstate signs need an EV icon for level 2 and 3 charging to show in the corner of the logos on the sign. Even better, add a solar panel, cell radio, and a small board computer and it can light up the icon red, yellow or green depending on how many are in use through some kind of opt-in system.
Given that everyone has smartphones and most cars have Internet connections, I think it makes more sense to distribute this data over the Internet rather than adding lots of physical infrastructure.
For users of Tesla's supercharger network, the car's navigation system displays the charging speeds (various levels of L3, from 72 kW to 350 kW) of the superchargers and the current number of unoccupied stalls. This is much better, and cheaper to deploy, than electronic highway signs.