[slightwinder]

Isn't it more a fork of android with some loose inheritance from 3DS?

But anyway, the problems of software and online-service in japan are old, very old. To some degree it originates in their late adaption of PCs with broader parts of society, to some other degree their early adaption of online-services in the age of featurephones including all the horrible patterns.

Japans society developed quite different in those areas, and you see it all the time with their software, culture and decisions. Nintendo is not really special there.

[Operyl]

Nope. It contains AOSP code (which started the rumor mill that it was Android) but it was not. It also contains some code from FreeBSD, which similarly sparked the rumor that it was FreeBSD, but alas it isn't. I spent a good amount of time in the early Switch days picking apart the operating system.

Here's a good wiki with a ton of information on the kernel/os: https://switchbrew.org/wiki/Main_Page

EDIT: Here's some AOSP usage: https://switchbrew.org/wiki/Nvnflinger_services https://switchbrew.org/wiki/Display_services and apparently some AAC codec code.