gifts do not count as unearned income.
So the super-rich people down the street are fully supporting their ne’er do well kid, spouse & grandkids. They let the family live in a house and use cars (and pay for all the upkeep) that the parents own and let the family use their credit cards to pay all their living expenses. They own no property in their own name, and have no bank accounts in their own names. Since the Bank of Mom & Dad are paying for everything, they don’t have to work and can spend their time playing bridge or polo or doing pottery when they aren’t taking the kids on exotic holidays.
But now it’s college time, and look! they are ‘eligible’ for free college for the kids b/c they don’t have any income! Don’t need more money from the 'rents…just get them into a generous college.
Is that your worry?
Ofc, everybody has to file taxes, even if there is $0 income, and those returns are required as part of the financial aid paperwork. A family with $0 in income but nothing filled in for government supports is going to raise a question.