Probably never. Usually, when they want to add predatory practices to their consumers to their games, they develop it in far before release.
Also, Nintendo typically avoids the BS from other mainstream publishers. We have yet to see microtransactions in a premium 60 dollar game, we have yet to see them muddle in cynical pre-order culture (the worst they pulled off was "get some bonus item if you preorder, there was no gameplay segments and stuff locked behind a preorder" and the one Mario game that HAD done it, Mario + Rabbids, surprise surprise it was Ubisoft who published the game, not Nintendo). The worst they probably done is something like Nintendo Badge Arcade and even then I don't think it's too bad: the game does kinda egg you to spend money, but they never get further than that (the rabbit just says "that's cool" if you decline, and that's it) and it's free anyway, and I did receive lots of nice badges to decorate my home menu with, spending money once only to get the Baby Luigi badges that I really wanted. The home menu badge limit was a far bigger criticism of mine that Nintendo Badge Arcade's way to get you to spend money tbh, because that godforsaken limit was what got me to stop playing Nintendo Badge Arcade, there's no point in accumulating more badges if I hit the stupid limit.
Amiibo is also the worst Nintendo has done, but I still say it's nowhere near the worst of publishers who had meddled in microtransactions and loot boxes.