2) Don't have to type
3) Coolness factor (good for looking cool the FIRST time anyone else sees yo do it, after that... dork)
1) You have an open mike, letting the company spy on everything you say. On a device that also tracks your web browsing and physical location. And you pay THEM for this???
2) Everyone else can also hear what you say. So it's not just the company, it's everyone else spying on you also.
3) And they don't want to spy on you, instead you are simply the annoying shmuck making way too much noise.
3) It actually takes more time, to do than to type (assuming you are a fast typist)