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On the legal side, there`s things such as instrumental playing (probably where he learned this) and jobs that require a delicate touch (mostly dead arts such as locksmithing and clock work).
On the less legal sides, desxterity such as that (try a few of the moves, even on solo fingers, they are hard) probably would have lead him to a decent life as a pickpocket.
Overall, interest little video for the purposes of showing of dexterity, but as for "finger dancing" the idea seems to fall flat.
"Haha, look at me! I can dance with my fingers and look pretty damn stupid!"