More than 5,000 people in Sweden have RFID chips injected under their skin, and Swedish people are pretty impressive. With an RFID implant, you can open electronic locks with a wave of your hand, store your business card and other information, and even keep your COVID passport. The process has been approved by the FDA to store medical records, so you could even have a surgeon do it, theoretically.
Usefulness: 8/10. There’s a small chance of infection, plus the possible privacy and security concerns, and they can be a pain to remove, but it’s all worth it to anger people who think chips are the “mark of the beast.”