You can find my voice at https://video.benetou.fr/ and elsewhere on the Internet because I did talks are conferences.
I’m not particularly worry by it … because I expect people who are important to me (family, friends, even colleagues) to be trained enough (because it’s not about intelligence) to contact me back (as they have my number, email, etc) if anything serious were to happen.
IMHO it’s mostly a problem for basic phishing attack where somebody is rushed to provide information. As soon as the person replies “OK let me call you back” then the whole threat disappears. Well… if the hacker did manage to control your phone number or your email that’s a totally different ballgame though but I assume we’re not talking at this level.
Absolutely, in fact you can easily (clone your own voice, create a new email address like LGTM_butnotop@discuss.tchncs.de and attach the recording where you ask for a Netflix/Apple/whatever gift card) do it as a harmless prank just to gauge how they’ll react.