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Do I have to answer this question?
Money.
Gold points are earned by buying select Switch games and hardware. You use it to buy stuff online related to the Switch. Nintendo wants to reset everyone’s progress for the Switch 2. If you want to use gold to buy Switch 2 stuff it has to be gold earned buying Switch 2 stuff.
Greedy? Yes. But then again, it’s a rewards program they don’t even have to offer in the first place.
Just like how Japan had, up until late last year, been majorly under the governance of the Liberal Democratic Party (Read: Conservative traditionalists).