“I am told that these are people who fall through the cracks of social programs.”
That usually means that they made too much money recently. Basically, punished for being too productive and self reliant as a rule.
I’m thinking some or even many were folks, almost “street people,” who weren’t exactly homeless but made their incomes from menial jobs, from hand to mouth but definitely cash and/or barter, even holding signs begging and “stayed behind” during evacuations and now have no “safety nets” other than these virtual soup kitchens.