Ever tried to uninstall an antivirus on windows? Or any program that does not want to be uninstalled? I've had programs whose uninstall.exe was no different than /bin/true.
replyOn this point, Windows is no better than macOS: the OS relies on the goodwill of the developers to provide working uninstallers. The only protection is a world where the OS provider does the application packaging: Linux repositories, Mac App Store, Windows Store. And even then, apps are still free to litter your filesystem at runtime, unless they're heavily sandboxed. Then FlatPak it is, or iOS apps or Android apps. Not great.
Yes, I have uninstalled antivirus. The uninstaller removed most of the files, except those in memory. I turned off the computer at the end of the day, and after startup the next morning the remaining files were gone.
replyThe only remaining files were the "user space" like custom preferences or files created by the user using the program. The uninstaller rightfully leaves it up to the user to decide what to do with those.