It is a Cardioid Dynamic microphone—it only picks up sound from the front and reduces background noise, improving your podcast sound. Still, she is not immune to the vagaries of YouTube’s algorithms. She said her Musk channel yielded €7,500 a month, down from €50,000, or about $50,000, in November. Her former students have also seen a drop in income, she said. Recently, she created 16 channels in...