People won’t know where the message comes from, they’ll just hear your voice as though you were standing next to them. Everyone hears it at the same time. The message is not translated into anyone’s native language, everyone hears it exactly as you say it. The maximum length is 6 of your breaths.
I feel like it wouldn’t be long until people learned they all heard the same thing.
Possibly, but there’s also more then a billion English speakers, so we’d definitely see some shit before then.