Hacker KapuccinoHeck has shared some findings about the new NES emulator that is part of Nintendo’s new “Switch online” offering. Apparently, it’s fairly easy to load your own Roms (on a hacked Switch) and play them directly, which the hacker demonstrated by loading Kirby’s Adventure (video below).
A Nintendo representative was unable to offer an official company response as of press time. (Instead, the rep offered a "ha!")