It's worth noting this kind of thing is why the Apple headset OS is designed specifically to keep eye tracking information to an OS-only layer, at least outside of traditional VR style full immersion apps.

How many times are we going to fall for this? It's all fun and games until Apple is facing a bad quarter which is not if but when.

And even if they don't share it- they can still use it for selling ads on their platform.

Apple has been pretty good at sticking to the premium market and not exploiting its users. However, even if we assume that Apple stays that way, their products might not be affordable for all users and many will choose less privacy if it comes with a reduced price, especially if they can barely afford a device as is.

It'll be amazing if that level of tracking proves advertising is grossly overpriced and only modestly effective.

Apple is extremely transparent and they'll definitely share data that proves the ads they show are a ripoff.

A fair point well made.

They could rotate the code every few seconds.