> confirmation bias, eg. "facebook is secretly listening to you"

Agreeing with your general point - don't jump to conclusions without evidence - but I don't like it if we're now establishing the "Facebook/Google/Apple/etc is secretly listening to you" rumors as the canonical example of that behavior, and thereby exempting companies from further scrutiny in this.

We've seen that by now there exists both the will and the technical means to pull off stuff like this. So even if it used to be a baseless rumor and urban legend, it deserves to be re-checked periodically, because companies might start to do it for real at some point. Samsung here actually did.

(Google also comes awfully close with its "song detector" which is now a stock Android feature I think)