I think the robot tax could work though. Your theory is that you are taxing the robot, when in fact it is the business getting taxed. So no robot rights needed just protections for certain types of machines doing certain types of work. For instance, any machine that needs any form of direct operation (something that you could not set a few parameters to get a “days work” out of but repetative resetting after each unit was completed) would be exempt. Also, there may be an initial hit to inventors but a free capitalistic market would set that right, would it not? Maybe Mcdonalds won’t pay the premium for an invention but if Hardees wants the initial patent to themselves Mcd’s may up the offer. Lastly, with the total savings to business from not just an employees wage but the taxes and benefits included, a tax for automated work wouldn’t hurt consumers anymore than an increase in minimum wage. Probably much less. That’s how big the overall savings to the business could be.