I think Nintendo has a similar attitude to Apple in this regard. Sure, Apple could probably make a lot of money by selling subscriptions to iMessage on non-Apple platforms, but that sacrifices control and gives people a reason not to buy their hardware.

Nintendo has historically demonstrated that both of those things are extremely important to them. For example, it's not uncommon for Sony and Microsoft to sell boxes at a loss for the first few years, making their money back in software. Nintendo typically doesn't do this.