I'm struggling to get a definitve answer to whether wearing a bodycam while cycling is illegal.

i know switzerland has some odd laws regarding privacy but surely in Geneva of all places, cyclists are allowed to record their journeys.

Hands down the worst city I have ever cycled in, people and mainly drivers really do not give a f*** about rules and others. 

and before we have the usual "but cyclists do x, y or z" I've yet to see, hear or read about  cyclists killing people soo let's put that back in deck.