[Zoom] Improve screen sharing security to prevent explicit content exposure

Looking for technical insight into a strange Zoom screen-sharing incident. I was helping run an online session with roughly 60–80 attendees. There were three organisers: a host and two co-hosts. One of the co-hosts was presenting and sharing their screen while showing slides from their computer. About 20 minutes into the meeting something unusual happened. The shared screen briefly went black and then explicit video content appeared full screen for a few seconds. The meeting was ended immediately. Details that might help: • The presenter was already screen sharing when this happened • I did NOT see the usual Zoom message saying another participant started screen sharing • The screen appeared to go black for about 3–4 seconds before the content appeared • The content filled the entire shared screen (not a small popup window) • The incident lasted only a few seconds before the meeting was terminated Questions for anyone familiar with Zoom behaviour: 1. Is it technically possible for another participant to start screen sharing while someone else is already sharing without Zoom showing the “X started screen sharing” notification? 2. If someone is sharing their entire desktop, could a browser popup, redirect, or malicious ad open and take over the shared screen like that? 3. Could switching windows or tabs accidentally during screen share cause the screen to briefly go black and then show different content? 4. Are there known Zoom behaviours or bugs where the shared screen source changes without the usual notification? Zoom Trust & Safety reviewed the report but did not provide technical details, so I'm trying to understand the realistic explanations from people who run Zoom meetings regularly.