Nintendo of course, doing things properly when it comes to something they really care about, which is piracy. If you root the Switch, enabling piracy for all, what are you going to do? To actually enable piracy for all, you have to disclose the vulnerability to the public. Nintendo will patch that up, but hopefully people who never upgrade their firmware will be able to use that crack forever.
Or you can just tell Nintendo the vulnerability you found and get an undisclosed amount of money, which could be pretty nice.