Zoom, the software many had never heard of prior to COVID-19 and the lockdowns that followed, surged nearly 400 percent last year. But as many industries return to being in person — and competition flourishes due to other businesses offering services accompanied by other features — it took a more than 15 percent tumble on Tuesday. This is a good thing. Amid societal decay and economic turmoil, Chinese-American billionaire Eric Yuan’s company made a killing. Although shares fell, the stock recorded an astounding $1 billion in quarterly revenue for the first time in its history, beating analyst estimates. But as...