I don't see this as a binary thing. Legally we tend to draw a clear line between child and adult for pragmatic purposes, but I don't think my responsibility of intent disappears just because someone hits a magical number. I have steered clear of various gambling / "gaming" jobs which have had silly high salaries as a result; I don't in any way want to participate in things which are meant to play the weak points of the human psyche like a harp, for profit.