Fast charging of 5 to 10 minutes is not far off now
Yeah, looks good in paper and it will happen, but lets not ump ahead of the physics.
Assume you want to put 100 kWh into a battery. For charging in 1h, the power supply needs 100kW per charging location. If we are talking a very super market car paces could be up to 100. So 10 MW supply where as a large Supermarket draws around 1 - 2 MW.
Now you want to charge those 100 cars in 15 min, now your power supply to the car park is 40 MW, 10 min = 60 MW.
If you are talking a large suburban shopping mall with 1000's of car spots and you are promising 60min full recharge times, the shopping mall will need a power supply akin to a small aluminium smelter.
Yes, shopping centres will have destination chargers and yes they may offer this power for free or discounted, just like many retail, restaurant etc. But it will be destination charging rates only, which is typically 5 - 10kW and the rate of charge will depend on the total number of cars under charge at once.
As for providing fast chargers free. No, there is so much money involved in the required infrastructure, no. Maybe discount rates, also would you want a high cost supercharger sitting there for 1-2 h waiting for the owner to come back. It will have a charge fee.
An EV on a 7kW charger over say 3 hr of mall time gets 21 kW or around 65 - 80 km of range.