This is kind of a dystopia disguised as a utopia to me.
Who builds the robots?
The robots build themselves.
Who builds the factories that build robots, who mines the raw material to make them, who provides the fuel to run everything?
The robots do these things too. There is no human labor, the robots do everything.
Who owns the land and the buildings and the infrastructure to support and maintain the robots?
Obviously, the robots own everything as well.
Who makes the decisions about distribution of goods and services?
The robots make all the decisions, dispassionately and fairly.
But who writes the laws?
The robots.
And who enforces the laws?
The robots.
I... don't forsee this scenario ending well for the humans. The problem is, a civilization in which humans play no active role is also one in which they have no power. We'd basically wind up as morlocks, assuming the machines don't just grind us up into lubricant first.