The amount of data required for constant recording and streaming of audio would be ridiculous

Relax, it is no big deal. Less than 1 GB for 24 hours of constant recording in good quality.

Even much less with compression (mp3 etc) and a little loss of audio quality. And if you leave away all the silence, I guess you can tune it down to a few MB.

That’s one harddisk for a year. But ofc you don’t even want to keep a whole year.