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This could be the case if we would talk about one game. But the whole Mario, Zelda, Pokemon, Kirby, Metroid and etc. Franchises are exclusive on Nintendo and they are objektiv good games (maybe pokemon has fallen of but it’s still a money grab) you don’t have that many exclusives on PS4 and 5 and Xbox one and X/S together. And it shows. The Switch and Switch light still outsells Sony and Microsoft consoles.
My friend group got switches mainly because of pokemon. But I dropped it for other games because Gamefreak underdeliverd IMHO.
Also we know that Nintendo is overprotective about their IPs. I guess they think that if they solely sell their games on their closed system they can decrease the chance of pirating. And it’s not far fetched because you need a decent PC to emulate and play switch games. Also know how on how to set it up. (which why I belive, that the onemillion is just a fantasy number from Nintendo in this case)
Of course they would make a fortune selling their old games on pc. But it’s Nintendo we talking about, they are super conservative about things like that.
If they harden up because of hard water (for example water with a high lime content). Try to put them in a bucket with water and two big scopes of citric acid powder 4h to 12h before washing them. You can get citric acid almost anywhere online (ebay, Amazon etc.) This should soften them.
You can also use citric acid as a washing powder replacement if you don’t look for deep cleaning but softening your cotton cloth, but don’t use to much of it or too often because it can and will attack the metal parts of the washing machine.
But usually the the motor will die before serious damaged is caused as long you don’t overdo it.