Just as in buying computers, buying food, education, airplane fares, consumers want lower prices which is a good thing. In the case of taxis, that means the elderly who often need them because they can no longer drive and are on a fixed income can more readily afford them (surely a leftist notion).
There is no disagreement that "economic rents" are harmful to the economy, giving people artificially high profits (see the Wikipedia entry).
Are you saying that a politically left magazine want to harm the economy through economic rents instead of helping it through wealth creation? Who would be for that?