Toronto taxi medallion prices peaked at $360k CAD prior to Uber entering the market [0]. That seems like pretty strong evidence of the system being coopted to serve the interests of medallion holders rather than consumers.
Market forces lead to consumers being hurt all the time due to externalities, information asymmetry, monopolistic / monopsonistic / platform owner powers, etc.
[0] - https://globalnews.ca/news/1780260/toronto-taxi-licence-pric...