The Nintendo eShop is the safest digital storefront in gaming, mostly because Nintendo actually treats parental controls as a primary feature rather than an afterthought. It’s clean, it’s rarely buggy, and it doesn't feel like it's trying to trick you into a subscription every five seconds.
That said, it is still a store. The 'Free-to-start' category is a minefield of microtransactions, and the constant sales can make a kid feel like they're 'missing out' if they don't buy right now. Use the Wish List as a buffer—tell them if it's still on the list in two weeks, you'll talk about it.

