Completely agree. I use multiple ad- and tracker-blocking browser extensions, but mostly due to the tracking. Incidentally, while blocking ads online can be noticed by the serving party (to e.g. display an annoying warning) those behind the goods/services being verbally advertised are none the wiser.

> There are ways to overlay inaudible tones

Are you referencing prior work or was that hypothetical? There is actual prior work on this. They were able to engineer a POC that could trigger "Hey Siri" and "OK Google" inaudibly by broadcasting it with ultrasound on a harmonic of the correct frequency, but at a pitch inaudible to humans [1]

[1] https://arxiv.org/pdf/1708.09537.pdf