The Mig Switch is real and it works. Or at least it does according to the YouTubers that have all received pre-release versions. While the Mig Switch is currently up for pre-order and hasn't yet made it into the hands of the public at large, the big unanswered question about this device is whether it does anything else except pirate games.https://www.notebookcheck.net/The-Mig-Switch-seems-to-be-missing-the-one-killer-feature-that-could-make-it-more-than-a-tool-for-piracy.801583.0.html
No one has seen it in the wild yet, Nintendo might just block its functionality with a single software update.