I mean,they could get better bags that keep the food warm,or a "heating spot" downtown to heat the food,but it's prepared in the kitchen? I don't see how it's impossible,just nobody willing to invest in the Business model that's not a scam

I think inequality is part of the story here too, even with restaurants generally. 60 years ago, it was reasonable to save some money at your union factory job to open a restaurant. If it didn't work out, you could go back to the plant and finish out your 30 years and retire with a full pension.

Now, I'm a top decile professional and would basically have to bet my whole net worth, including my retirement money, if I wanted to open a real restaurant. No wonder chain restaurants rule the day and the only thing interesting happening in food in most of the country are in food trucks. Ghost kitchens, at least a few years ago, seemed like a logical next step after the food truck: an even less capital-intensive way to get into the food service business.

The same forces will push someone who has this ambition to go the ghost kitchen route. Hopefully failing this way instead of with a fully staffed restaurant has saved at least one family from total ruin (downgraded instead to partial ruin).