Continuing from this:
I will say that this can happen with anything … from collecting pins (hats off to Terry Pratchett) and stamps, to getting addicted to going to the gym (an otherwise beneficial activity).
Unless we are talking about objectively (in the chemical way) addicting things ( e.g. smoking, coffee, drugs, sugar etc), then humans can get addicted with any conceivable thing, depending on their own psychological condition, without that thing itself being addictive of having “a dark side”.
E.g. Ain’t no “dark side” in driving a car in and of itself, but once there is a competition for anything, there will be humans, often very extra-ordinary, that will rise to that challenge (and train in addictive levels and risk their lives over it). Here is the legend himself, Ayrton Senna (it is less than two minutes - a window to this man’s mind - definitely worth watching):
Senna was clearly a fantastic human being since he was at the same time extremely ruthless within the context of winning the competition (they could have both died in that crash or get crippled) and charitable (he spent millions for the poor) and willing to risk his own life to save others on the track once the sense of competition became irrelevant (he saved another driver by stopping and running through the track to shut his engine off).
Again, we are tackling a “human nature problem” here, no a “Go problem”.