$3-15.$ Zoom has been criticized for opening up its platform for use by nonpaying users $($with some restrictions$).$ Why would Zoom do this, and why would paying customers care?$3-16.$ With the surge of Zoom users came a surge in scrutiny about the software$$s privacy and security. Why do you think Zoom developers built an insecure piece of software?$3-17.$ What is your prediction for Zoom$$s long$-$term success? Do you think users will fall away as things normalize from COVID$-19?$ Will competitors reveal better tools that steal market share? Explain your answer$\mathrm{.}3-18.$ Have you used Zoom and$/$or any of the competing videoconferencing platforms offered by Facebook, Google, Microsoft, and so on$?$ How are they similar? How are they different? Which platform is your favorite? Explain your preference$\mathrm{.}3-19.$ Despite an already solution$-$rich and competitive market for videoconferencing platforms, Yuan saw an opportunity that turned into a billion$-$dollar company. Can you think of any markets today that may have many competitors and alternatives but products that are lacking?