Zoom has long been the most unsecure video/voice application.
Remember how they installed an open web server on people's computers which could be accessed by anyone through the web?
https://infosecwriteups.com/zoom-zero-day-4-million-webcams-...
Apple had to step in and patch it for them:
https://techcrunch.com/2019/07/10/apple-silent-update-zoom-a...
Or when they sent your chat data to Facebook?
https://www.vice.com/en/article/zoom-ios-app-sends-data-to-f...
How it was discussed on HN: https://news.ycombinator.com/item?id=22703000
Or when Zoom was leaking private information?
https://www.vice.com/en/article/zoom-leaking-email-addresses...
Or do you remember how those geniuses rolled their own crypto?
https://citizenlab.ca/research/move-fast-roll-your-own-crypt...
Or maybe you remember that Zoom has the ability to listen in in real-time on meetings held on their platform?