Most common malware is on windows (think IE browser bars and such).
As far as the zoom issue, that's just one specific instance that came to mind. Yes, with a proper package manager (like aptitude) that's managing all the files, you are much less likely to have these kinds of things, so yay linux. On the flip side, most consumer OS's (windows/mac) don't go in for that kind of package management, usually relying on the app to be in a single place or have a packaged "uninstall".
As far as the specifics of the zoom problem, it's definitely not a chrome issue, as it's a standalone web server running locally, not a url protocol handler. And it's not quite an OS issue, other than that the OS allowed it.
- OS issue, not being enable to remove applications (or an exploit)
- a chrome one(!), actually chrome installs it on demand as it remembers doing it earlier - likely an url protocol handler.
There are worse things with poor solutions including being able to survive OS reinstall... The infamous Minix - "Are you scared yet"[0][1]
[0]: https://tech.slashdot.org/story/17/11/07/1041236/minix-intel... [1]: https://itsfoss.com/fact-intel-minix-case/