I have, unlike the other comment, no idea what you want/can do or what “audio cable” you mean. But the answer is yes, both as in using the wire with and without the original USB connections. You can use essentially any wir for audio, or is essentially DC, so unlike wires that carry information (USB, HDMI, …) there is no need for shielding etc
Don’t charge LFP to 4.2 volt! The crude “check voltage and if below 3.6 V keep charging” is okay too as long as the maximum current is within battery spec. But measure while charging, don’t turn that off to measure the open circuit voltage.
In total, yes, maybe more. But over, likely, thousands of people and, mostly, for minor things here and there.
Also, just throwing money at people is not somehow a failsafe way to get something. Not everyone can be corrupted and not everyone seeing the corruption is going to be quiet about it.
That’s the thing, they do use kg. So it is not something they don’t know about. Just that stone for people’s weight specifically somehow is still in use.
For the pint, I do not think it is about the volume when someone says that. As of they are only going to drink one anyway?! Replace it with beer and it is a perfectly normal thing to say.