> Merging reduces platform inefficiencies

None of the money saved by reducing inefficiencies will lower prices for consumers or increase pay for drivers. The goal is always to charge customers the most while giving them the least, while paying employees as little as they can get away with. In theory merging also kills off competition that might steal customers and workers by offering better prices/wages, although in practice companies share the same goal of screwing over both consumers and workers and are perfectly willing to resort to collusion in order to do that most efficiently.