Amazon and Google offer convenience devices that listen for your spoken commands, transmitting for analysis all captured sounds to the web. If a crime is committed at your location, this information could be subpoenaed at least in certain circumstances (precedents are still being established)...
One Of Many Cases, This One From 2017 In Case You Missed It
But app(lication)s are now being developed to intercept the audio and use it for, oh, perhaps nefarious intent...
Eavesdropping And Password Phishing O Matic A Tron
Fortunately these were just proof-of-concept dev exercises and we ALL KNOW THAT THERE ARE NO SUCH SCRIPTS OR PROGRAMS IN THE WILD AT THIS TIME NO THAT'S ABSOLUTELY IMPOSSIBLE IT'LL NEVER HAPPEN IN A MILLION YEARS.