Because they're convenient. In my house, you'll hear - Alexa, when is the Bills game? Alexa, when is daylight savings. Alexa, play Christmas music. Alexa, what is the etymology of wanker? Alexa, is Chipotle still open? Alexa, how old is Patrick Maholmes? Alexa, what time is it in Kenya? Alexa, ad nauseum.
If Amazon wants to datamine the dickens out of that to sell me more socks and USB cables, I really don't care.
Isn't this the most trivial and minor of conveniences? Wouldn't it take roughly the same amount of time to pick up your phone and type that? Don't you feel the least bit uncomfortable that the trade-off for that is that a tech giant gets a 24/7 audio feed into your and your family's home?
If Amazon wants to datamine the dickens out of that to sell me more socks and USB cables, I really don't care.