I don't understand. Robust markets don't have large margins. Why would a regulator even want markets with enormous margin? That's usually market failure.
Pharmaceuticals have very large margins.
Most people also complain about how pharmaceuticals are greedy corporations that seek to exploit monopoly status for profits above human health. Hardly a good example of a well functioning market.
Complaining doesn’t mean action. To affect prices people need to vote with their wallet, and they won’t do that when their life is on the line.
Or to put it another way, find an alternative.
Are you trying suggest that Apple’s margins are so small that they need state protection? Or that Apple can’t compete if they’re not able to tightly lock down every aspect of their ecosystem?