You're describing telemetry to improve the overall performance of the window. That's very different from what Mozilla: listening in to what is sent between the teller and I. They even gave an example of a trip to Spain and recording it as travel. That's going way beyond the performance of a window. The teller is probably already doing that. The window operator has no business listening in on that discussion nor recording even a summary of details of the discussion.

Anti Commercial-AI license

The example of the "search optimization" they want to improve is Firefox Suggest, which has sponsored results which could be promoted (and cost more) based on predictions of interest based on recent trends of topics in your country. "Users in Belgium search for vacations more during X time of day" is exactly the sort of stuff you'd use to make ads more valuable. "Users in France follow a similar pattern, but two weeks later" is even better. Similarly predicting waves of infection based on the rise and fall of "health" searches is useful for public health, but also for pushing or tabling ad campaigns.