[throwsoundpop]

How can we be sure there isn't a similar, more subtle version non-removable installation now?

(I briefly had Zoom installed a few months ago, then un-installed it, but I don't know how to verify).

[fiddlerwoaroof]

If you can make a virtual machine equivalent to your computer: make one, get a list of all the files (and dump the registry on windows), then install and uninstall zoom and repeat. Then just inspect whatever the diff is.