The $1K chargers that wouldn't stress an existing electrical panel aren't worth it for EV users unless they're in a dire emergency. It takes 6 hours for a full charge on one of these. Great for a hotel, but not for a gas station.
The ones that charge a car in 30-60 minutes generally have their own dedicated transformer, the size of a fridge. Two cars can pretty easily use 300KW with older tech, 600KW+ with newer stuff. If my math is right, that's 2,500 amps on traditional 240V service. My house has 100A service for comparison.
For reference, back in 2013 when there were only the 150kW superchargers, the costs ranged from $100k to $175k for the charging stalls and transformers[0]. In 2015 it was said by Tesla's investor relations manager that it cost about $270k per station (presumably gen 2 250kw chargers)[1].
I'm not sure how Electrify America installation works, but for Tesla they front all of these costs so all it would take to get them installed at stations is the landowner allowing it to be placed on their land (likely with some sort of revenue share agreement, if they don't think they'll get enough money from the increased foot traffic).
The ones that charge a car in 30-60 minutes generally have their own dedicated transformer, the size of a fridge. Two cars can pretty easily use 300KW with older tech, 600KW+ with newer stuff. If my math is right, that's 2,500 amps on traditional 240V service. My house has 100A service for comparison.