By free, I mean "free of human effort"

If you own a factory, what you see is a big box with input and output, human labor is just an annoying variable, removing it won't turn the entire thing "free".

The owner will still expect to trade the output for something else for his benefit.

I am thinking of a case where governments will own the robots. People will pay some minimal tax to pay for the maintenance of the robots. If other robots can be made to do it, then even that cost is saved.

Government will, among other things, oversee that the needs of the people are well served by these robots.

If you think about it states are not much different than corporations.

Taxes is human labor dedicated to the maintenance of state.

I think it is naive to think that once humans are not needed they will magically be fed by the machines.

>If you think about it states are not much different than corporations.

At least democracies have elections and that is a big difference.