The value of convenience may be significant but is it really great enough to find the cost of providing that convenience without external subsidy over the long

The value of convenience may be significant but is it really great enough to find the cost of providing that convenience without external subsidy over the long run. To me it is ridiculous that anybody thought local personal services like food delivery, dog walking, and taxi driving could ever be converted into durable, efficient, profitable national or global monopolies. In the absence of monopoly power such low barrier to entry commodity services invariably see their profit margins squeezed to cost from competition. All this is freshman or highschool level economics.