15 seconds at a time, when the owner activates the feature. The scale of its recall is not meaningfully different than someone scribbling down 15 seconds worth of what they hear someone say (or even just remembering it), and does not pose a greater privacy risk than a scratchpad or human memory.

It’s also much less effective at recording people speaking for long durations than the audio recording feature that every smartphone for the last 20 years has supported.

If you don't want any one to write down or remember what you said, maybe don't say it to them?

Human memory keeps more information than this feature does.