Robot Minimum Wage

and the robots have to give all their wages, initially to the unemployed and underemployed and then eventually, when all the non-automated jobs are gone, to everyone.

Put another way: robots are paid a wage somewhat comparable to the wage that would have been paid to a human worker. Those wages are taxed at 100%. That tax income is then used to fund unemployment payments, and over time, gradually shifted over to pay for a universal basic income.