This is exactly what we all need: another way for big tech to personally identify us. It's a good thing they are so interested in figuring out who we are, because they just aren't cyber-stalking us enough. They need to cyber-stalk us more!!!
Bad sarcasm aside, what's wrong with an old-fashioned user name & password? How about instead of scanning our dirty, floppy parts, they just let us do what we've done successfully for years. Has typing suddenly become that hard for people?