Hmm definitely three of those have nothing to do with privacy. Seems like clickbair to me.
Wudo - yes you may not want that, I've switched mine off as our broadband is slow as it is. But privacy issue. Really?
Wifi sense - again how is that a privacy issue. On the contrary, unless you have a guest wireless network like I do, you don't have to give out the key to your network.
Cortana - sure this could be argued that it can be mined, and likely is. I think the benefits way out way any concerns anyone has with this or Siri, Google or speaking to my car.