Earlier quoted context omitted.
This is a very cynical take. I've not seen anything to make me think this feature is intended for surveillance as opposed to personal utility. The personal utility benefits are very clear to me - the problem is the ease with which malicious attackers might steal the data (if they can breach the system).
My take is more cynical. They actually want your soul. By collecting all the information that was ever used to train the neural network between your ears, they can create a synthetic version of you, to impersonate you, and some might even argue resurrect you, inside a computer, to torture you Clockwork Orange style with an endless display of ads, predicting what the fleshy version of you wants to buy, how to preempt…
And where are we ultimately heading? To the very top, of course; towards the sun; towards enlightenment. The ancient people used various objects in nature to symbolize certain concepts, and the sun above the pyramid represents enlightenment — the highest state of awareness, knowledge and wisdom. The idea behind this is that the bright light from the sun allows us to see our environment and when we can see our environment clearly — i.e. when we can see things as they truly are — we can start to collect valid information about it and build a good understanding of it. That’s why when you withhold knowledge from people it’s called “keeping them in the dark.” This is also why one of the well known secret societies called themselves the Illuminati; they considered themselves the illuminated ones, because they possessed knowledge others didn’t have; in other words, they were illuminated by the extra knowledge they possessed while everyone else was (relatively) in the dark.