Many manufacturers do actually sell you these upgrades. Mercedes has AMG chip tuning, Volvo calls their stuff Polestar (swedes and their funny english), BMW does it at least for the 1-series, etc etc. In most cases it includes not only ECU remapping but also cooling upgrades.
As for throttling the engine to sell at a different price point: in many countries this relates to government taxation on horsepowers. I don't see this as particularly nefarious by the car manufacturers.
As for throttling the engine to sell at a different price point: in many countries this relates to government taxation on horsepowers. I don't see this as particularly nefarious by the car manufacturers.