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The fact that there is a grey zone does not mean that there aren't also black and white zones. It more interesting to think about the grey zones, but it's easier to get things done in the back and white zones.

That's true, but I don't think a general purpose API for improving the addictiveness of any application exists in one part of the spectrum. Anyone can use this.

If we look at something like the activity circles on the Apple Watch; that's safe enough in my mind to be pretty well in the white area.

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