I think they might want to know how it’s different from Social Security insurance.
Isn’t SS based on the taxing power, though? That would be how it’s different to me. They created a program and enacted a tax to fund it. The topic article points out that the judges are not listening to that argument, because that is not the power Congress says they are relying on in the bill.
Now, if we had privatized SS by saying everyone has to invest a certain amount in retirement accounts with private investment firms, your question would be a very valid one. Also, I would at least have some faith that I would indeed have money in an account when I reach retirement age, so that would be another difference. But that has not happened.