One sees so much nostalgia among Americans driving across the heartland for "the traditional diner instead of fast food chains where the food is the same everywhere", when in fact so many of those traditional diners are sourcing all their ingredients from Sysco. You can have the exact same eggs or biscuits, for example, in supposedly mom and pop places in state after state.
I think it was already in the mid 20th century that the US lost the diversity of cooking found in some other regions of the world, and so this latest development with ghost kitchens is only continuing a long trend.