In food delivery service, natural monopoly/oligopoly might exist and companies could eliminate competitors which adhere to minimum wage or treat their workers better. The eventual result could be unfairly high profits for these companies, not due to a better system or innovation but from shady practices.
In general I believe well-implemented negative income taxes work better than minimum wages, but given the weakening power of less skilled labor and political situations that limit redistribution of wealth/income, minimum wages are justified in certain cases.
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