Here is a movie of one very powerful bionic finger:
The question I want to put forward is: How much of the time is this guy actually gesturing? My guess would be that he does not really give anyone or anything the finger anywhere. He holds up his bionic finger for inspection, he talks to it as he watches it, he is using it as a scanner, fighting with in different ways, but he never actually flips the bird. He doesn’t really make the gesture. Therefore, besides being funny, this video neatly demonstrates how context changes the perception of (insulting) gestures.