Even without that last sentence, the comment is not helpful. We’re not told what the user sees as the benefits of Alexa, and we don’t know what he sees as the privacy trade offs. It’s possible he uses Alexa for some lifesaving utility that far outweighs even if Amazon were illegally violating his privacy. Or maybe he’s ignorant tot he specifics of what Echo and Amazon do/don’t collect. And anyone who replies is forced to play the annoying game of read-my-mind/how-dare-you-assume-that’s-what-I-meant.

It is a useful comment in an echo chamber like HN's. And seeing the downvotes it has received, it's double useful.

I think they have been massively downvoted because they were being a jerk, not because they (don't) value their privacy.