The outlet isn't a big deal. The infrastructure to support it is. You need to pay the supplier for additional supply lines, an electrician for the panel and other customer side infrastructure. That's the expensive part.
Most people don’t need a supply upgrade, because they can shift most of the charging to night time, and the majority of people don’t use as much power at night as during the day. Unless they have a very small service. But most people have it sized to support a stove, electric dryer and A/C, if they got service relatively recently. And most electric companies will do the service upgrade for cheap if necessary, because they’ll make it back from more electric use.
They do need an electrician to run the new wires to the garage though.
Yeah, apartments and condos are probably going to need supply upgrades... but the normal use case for charging IME is: park, and plug in overnight. With sufficiently smart EVSEs, you should be able to limit the charge rate to not have to worry about exceeding your electrical service, even with 2 cars.
Most gas stations shouldn't have car chargers, because even with fast chargers, who really wants to be spending 30-60 minutes at one? Fast chargers should be at restaurants and other places people will naturally want to be for a bit of time. Only gas stations that should have chargers are really things like truck stops, where they already have some amenities.
They do need an electrician to run the new wires to the garage though.