I would be surprised if you had enough data to be able to conclude such a lofty claim, especially accounting for increased availability of taxis in areas where there were none or few.

Either way, the benefits of price transparency are not imaginary, but they are also not the only factor. Things like insufficient buyers or sellers, government policy, etc are also in play.

All else being equal, a buyer being able to easily see seller A is more expensive than seller B for the same goods will result in lower prices for the buyer. But all else is rarely equal.