I'm guessing this is related to the "Zoom monitors activity on your computer" story https://news.ycombinator.com/item?id=22657384
replies(3):
Beyond the privacy concerns it's a security risk. Their desktop client had a remote code execution vulnerability last year:
https://www.zdnet.com/article/researcher-says-zoom-web-serve...
I expect it is more to do with the fact that you don't need the Zoom app and why should you have to download it when pretty much everything works perfectly through the web client?