Unable to completely uninstall Zoom meeting app
Apple will remove this for you if you have enabled keep system files updated.


https://eclecticlight.co/2019/07/10/apple-has-pushed-an-update-to-mrt-to-remove-zooms-hidden-web-server/




sudo softwareupdate --background-critical



https://tidbits.com/2016/03/30/make-sure-youre-getting-os-x-security-data/


To check your MRT Configuration Data updates, you can do that as well. Version 1.54 is the version that wrangles ~/.zoomus

system_profiler SPInstallHistoryDataType | grep -A 5 MRTConfigData




The remainder of this article applies to double check Apple and/or force removal and understand a bit more on what is running under the hood.

An installer that clears out this program that used to be installed is available - so you can clean manually as before below if you don't want to have zoom (or uninstalled it already).

If you want to use the software, just update or install the version from 9 July 2019 - https://zoom.us/download#client_4meeting

Before 9 July, the zoom installer was indistinguishable from malware in that it installs files and folders not part of a system manifest before the installer is approved to run. Then this “hidden” process opens a network port for a command and control server to receive requests and not ask the user before installing software or start up the camera and microphone. This listener can also re-install the main zoom program. I know the company says it's goal is to help users, but why not document this and get opt in from the computer admin account before taking these actions?

Until the vendor has a proper uninstaller, you should also delete and put a file in place to prevent the Zoom app from re-installing this persistent agent.

rm -r ~/.zoomus
touch ~/.zoomus


The first command recursively removes the process that listens on port 19421 and the second prevents the current installer from re-installing this "agent" if you choose to not uninstall the app. Once the above steps are done, you should restart your Mac if you're not comfortable finding and killing the web server that listens on the port 19421. 

We have tested this fairly rigorously, and removing this process - killing it and blocking it has no effect on the desirable function of the app, so if you need zoom or want to use it - cleaning this up to prevent A privacy breach or unintended reinstall is encouraged.