Update thanks to thethatfox:
Physical game cards may also not actually contain the game:
Nintendo Switch 2 Game-Key Card Overview
Game-key cards are different from regular game cards, because they don’t contain the full game data. Instead, the game-key card is your “key” to downloading the full game to your system via the internet.
Update 2: There is probably a difference in Game-key cards and card that contain real game data. So we don’t know right now how often these game-key cards are used or if nintendo is using them.
Except back then there were a lot fewer customers, cartridges cost a lot more to manufacture, and there wasn’t countless DLC to make even more money. Also, now there are so many games that the raw supply is practically infinite.