Regardless of whatever medium developers choose to release their games on, there will bound to be piracy. Whether it be a digital or physical release, somehow, someone will find a way. In fact it seems that less than half a year since the Nintendo Switch was released, it looks like cartridge ROM dumps are finding their way online.
This is thanks to a group called BigBlueBox who claims to have successfully dumped Switch game cartridge ROMs. However they are hard to find and a bit inaccessible at the moment, and obviously we won't be linking them here, but we suppose if you try hard enough you should be able to find them.