I don’t have Alexa in my house too and I’m not fred d. but I see your point between a company owned a/c and a privately owned one. The trouble is that the FAA set regulations for the most part that have borne out suggestions for public air carriers above a weight class(?) or passenger number to have cvr and flight recorder. If this wasn’t mandated, there would be countless NTSB reports without a final determination. Studying flight data and cvr without survivors continues to set safety standards upwards ever since data acquisition started with that little red box thingy. As to privacy issues and owning a private a/c, I think the option for the owner to enable or disable data acquisition may be a good compromise but then we’re all flying in regulated airspace that just happens to be public (except for military airspace). Data acquisition for private a/c has been stewing with all the glass cockpits and Garmins already having the ability to save data. And more often than not, a crash has already shown any data saved from electronics is examined as another piece in determining failure occurred.
Some years ago when surveillance cameras were being put up in metropolitan cities, a strong protest was made about privacy issues. The fact that walking in public spaces is not private with well meaning protests, those protests have fallen by the wayside as the same cameras are used regularly as electronic eyewitnesses to a crime not one single victim has protested against. Some victims may even be the protesters against video surveillance. How ironic is that? I believe the naysayers about surveillance cameras in public invading ‘their privacy’ has fallen into grudging silence while proving cameras can serve the public in positive ways. We’re not anywhere near Skynet, yet. Personal a/c saving data does have its pros and cons but if the commercial airline business and public benefited with cvr and flight recorders, data acquisition should not be as alarming for privately owned a/c.