Counter examples of capitalist industries that have lasted centuries without corporate concentration: restaurants, spas, bars, tailors, car washes, barbers, almost anywhere small businesses exist.
Adam Smith's original capitalism required free markets, which fundamentally require high competition, low barriers to entry.
The low barriers to entry component is missing from the examples you described, which is theoretically where government should step in (and lower those barriers for new companies looking to enter the market).
In healthcare, however, government is essentially working with the companies to raise barriers to entry.