No, see, this will work because, even if the microphone can’t be enabled -which I think it can- a workaround sending short audio files would fit too.
And also, you probably are unfamiliar with how live radio shows work, but people call there, and their calls are taken live, and nothing prevents unwanted calls to ALSO arrive there…yet it has been done and it continues to be done. A risk that is up to each and every streamer.