I was bringing it up as a starting point for discussion and to show how UBI doesn’t imply extra spending.
Proponents suggest bring more programs into a single UBI could significantly lower operating costs. A single check each month could replace some or all of: Housing assistance, Supplemental Security Income (SSI), Supplemental Nutrition Assistance Program (SNAP), Special Supplemental Nutrition Program for Women, Infants, and Children (WIC), Temporary Assistance for Needy Families (TANF), including Pass through Child Support, General Assistance (GA), Social Security Disability Insurance (SSDI), etc.
Healthcare in the US is similarly split across Medicaid, Medicare, VA benefits, ACA health insurance subsidies, Children's Health Insurance Program (CHIP), plus a host of things you haven’t heard of like Ryan White HIV/AIDS Program. There’s a massive opportunity for cost savings by simply reducing administrative redundancy.