They collect virtually everything you do on your phone. They probably notice that you scroll a long way after typing cat and so perhaps surmise the quality of search results was low.
Doesn’t that seem like a noisy signal since you’d have to disambiguate cases where someone was looking for a specific time/place and scrolling until they find it?
I’ve assumed that the reason is the same as why none of the voice assistants has an error reporting UI or even acknowledgement of low confidence levels: the marketing image is “the future is now” and this would detract from it.
