I don’t think battery life is a problem. I think the examples you mention were from much older phones with limited local storage, so they were basically just in a call the whole time, and burning power operating the radio. A modern phone can save the data to local storage and upload it opportunistically.
We know that modern phones fan constantly listen to the microphone with minimal power impact, since that’s what these voice assistants are doing. That’s specialized hardware, but adding a little something to save the data wouldn’t be hard.
Even if we take it as a given that it can’t be done on batter power, phones get connected to outlets pretty regularly. Have you ever heard someone refuse to charge their phone in their house because it’s creepy?
We know that modern phones fan constantly listen to the microphone with minimal power impact, since that’s what these voice assistants are doing. That’s specialized hardware, but adding a little something to save the data wouldn’t be hard.
Even if we take it as a given that it can’t be done on batter power, phones get connected to outlets pretty regularly. Have you ever heard someone refuse to charge their phone in their house because it’s creepy?