But Nintendo began cutting back on all ac amiibo stock well before nintendo online was even a thing. I dont think its realized just how badly the ac amiibo line did when it was first introduced back in 2015. Like, just talking from my own experience from back then, I was able to get complete sets of authentic Japanese boosters of series 2 and 3 wholesale for buy one set half-price, get the second for free. That's how terrible it was doing. Nintendo overprinted a ton of cards and amiibo figures, but because they only worked with HHD and Amiibo Festival at first, almost nobody wanted them, unless you were like a super fan of Animal Crossing. The AC amiibo stuff only started to get fan recognition when they became compatible with New Leaf along with the Welcome Amiibo update for NL, but by then it was already too late, and New Leaf was already 4 years old by then, so a lot of what would have been the core audience had already moved on from the game. Nintendo cut their losses relatively early, with the Welcome Amiibo line of AC cards stopping production very early. They were out for I think, like 3 or 4 months before they stopped production, making them the rarest set of the AC amiibo line, at least for now.
Retailers at the time were trying to dump stocks of the cards with extremely heavy discounts on buying them because they weren't selling. Just speaking personally, that's how I was able to complete all the AC amiibo sets because they were so cheap and easy to get. And by the time they did start to sell somewhat decently with the WA update for NL it was pretty meh, because NL was already relatively old by then. Not sure, but I think if you look online for like an AC amiibo figurine of any character, you can still find some places selling them for $5 USD, whereas Smash amiibo stuff rarely ever drops below $15 USD. AC amiibo at the time, were literally the bottom of the barrel for all the amiibo lines, esp. compared to Smash.
Now NH is selling like hotcakes and Nintendo is still on the conservative side of AC amiibo, which is understandable, because they miscalculated the first time and lost a lot of money. I'm not saying they have to increase production by 10000%, I'm jsut saying that unlike the first time, they actually have an active and interested audience for AC amiibo. NH is the most recent game, and it's technically not even a year old. It's popular, everyone is still talking about it. Unlike the first time, with HHD or Amiibo Festival, or 4+ year old New Leaf, they have an active and interested audience. And while I get why they're hesitant, they should at least try to make some reasonable changes to reflect that.