The technology to reproduce eye movements has been around since motion pictures were invented. I'm sure even a flat video stream of the user's face would leak similar information.
Apple should have been more careful about allowing any eye motion information (including simple video) to flow out of a system where eye movements themselves are used for data input.
"technology to reproduce eye movements has been around since motion pictures were invented"
Sure, but like everything. It is when it is widespread that the impact changes. The technology was around, but now it could be on everyone's face, tracking everything you look at.
If this was added to TV's so every TV was tracking your eye-movements, and reporting that back to advertisers. There would be an outcry.
So this is just the slow nudging us in that direction.
To be clear, the issue this article is talking about is essentially "during a video call the other party can see your eyes moving."
I agree that we should be vigilant when big corps are adding more and more sensors into our lives, but Apple is absolutely not reporting tracked eye-movement data to advertisers, nor do they allow third-party apps to do that.
Apple should have been more careful about allowing any eye motion information (including simple video) to flow out of a system where eye movements themselves are used for data input.