Am I missing something, or wouldn't you need one of these on each wrist, at which point you end up looking like you've just partially broken out of a pair of handcuffs?
If it's going to sense/trace movement to confirm and correlate inputs to actions, then both wrists/hands would need to be tracked, especially if a touchscreen is also being used (rarer I know at the moment, but would still be needed). I know rodents are normally operated single-handedly, but typing is a two-handed experience for most people.
And also one wonders how it differentiates actions that the valid person who should be using the terminal may make when they are sat at it but are not related to inputs? Or are they now not allowed to drink coffee or pick their noses?