If you replace all social welfare programs, you get around $3T/year, or $500/month for everyone (universal). That $500 now needs to cover all medical expenses, housing, and food for the subset of people who used to exclusively receive those benefits. That includes completely eliminating social security, which currently averages $2.5K/month.

Meanwhile, the vast majority of people receiving income (the universal part), would have a portion of their income previously provided by wages replaced with money that used to be used for social services for those that either needed them (based on the current definition of need) or had “paid in” with the expectation of income at old age. Who is benefiting from this?