Still havent figured out why we need Siri, Cortana, Google, etc. It doesnt surprise me at all that they are storing everything. The more this stuff happens the more I go silent in the digital world (at least in a way that is traceable).
Same reason we don't "need" a lot of things. It's useful, but not essential. I only use it for my watch though...
I have to confess, I actually like Cortana. I wouldn't use it, neither Windows 10, but seeing a few YouTube videos on the subject always makes me smile. She's actually pretty smart, way smarter than that Google voice thingie.
I went to to Google and checked my history, and there were only a few searches saved from about a week ago when I started using a new phone, and I deleted them. I don't use voice searches much anyway, but maybe I had changed the settings on my old phone to stop it saving my searches. I would rather my occasional voice searches were not saved. But, on the other hand, there's nothing of interest to anyone else. @amarildojr I'm interested in trying Cortana when it is officialy released for Australia. Currently, it requires chaning the region in Windows to USA, or downloading a recent preview build of Windows. At the moment, I don't feel like doing either.
Its the same with location history. You can see the route you have traveled on a map and search by date. Cortana is coming in the November Updates for Threshold 2 and its already available for Australia in the latest insider preview Build 10565.
If I ask Cortana about the wrong question for instance about the microprintinting on the dollar bill I might have a visit from the police or how many types of auto fraud there are.