Universities across the country have reported instances of Zoombombing, where malicious people enter an unsecured videoconference meeting and use the screen-sharing feature to display inappropriate and disruptive content. Most video conferencing services offer ways to protect your meetings:
CAEN encourages hosts to limit sharing of meeting links, and manage participant access to screen-sharing to ensure a positive experience for all. U-M Safe Computing also provides general guidance for how to Secure Your Videoconferencing.