Strange that they didn’t all use the same technology from day one
It actually makes sense. Each toll agency has its own standards and its own needs. There's no reason to expect that a toll system in Florida would operate the same way as a toll system in California.
In the New York City area it was ridiculous because there were at least four different toll agencies in the region, and they didn't all use the same technology when E-ZPass was originally adopted in the 1990s. They were working on designing a regional system, and two competing technologies were under consideration. The New York State Thruway Authority got impatient and implemented their own system with one of the two, and a few years later the rest of the agencies adopted the other one. So the Thruway had to go back and retrofit theirs to match the others.
Really? In a supposedly free market? (Likely different companies bribing different authorities differently.)
Best solution is no toll roads.