In general, I think people find it inconvenient to charge while shopping and such. First, they aren't going to get that much of a charge relative to the hassle and secondly, if the charger is not free, it's usually a lot more expensive than at home. I'm sure some people do that but most don't - look at all the empty L2 chargers around. In Seattle, where EV penetration of pretty high, they are mostly empty. The national average for the big charger networks is one charge every 2 days per charge port. and, that includes free chargers.
The simple fact that people don't understand is that EV charging is different than gassing up. You plug in at night and in the morning you have full range. And people are actually smarter than some think. They won't buy an EV with less range than their daily or weekly activities require. The "gas station" model doesn't work for EVs. And, to the obvious objection, EVs are simply not appropriate for people in apartments or condos until they can charge at home.
If I was Costco, I'd rip them out too.