Walmart is the largest grocery store in the country. Just giving out UBI and collapsing Walmart, without some sort of replacement would make things even worse for people living on the edge of food deserts.
Step 1: Use scale-derived lower WACC and an army of lawyers as cudgels to destroy independent retail and grocery in exurban and rural communities.
Step 2: "You can't get rid of us because without any other retail or grocery there'll be a food desert here!"