I initially only installed “Comodo Firewall” but for some reason they also installed a “Comodo Dragon Browser”, which I did not consent to. I always choose the “advanced” installation to uncheck bloatware, but in this case there was none and when you try to uninstall the browser, they force you to participate in their survey otherwise you won’t be able to uninstall the software…
Depends on the installer. Windows has been pushing the .MSI installer format which is managed to some extent by a centralized system install manager, meaning the system should be able to revert the changes without any custom uninstaller. Installers can still bypass it to some degree though, and it has an option to run a custom .exe on uninstall, but there is also a special cleanup tool (you have to download it separately from Windows support forums) that can “force remove” all the stuff installed by the .MSI.
But otherwise it’s like asking “can’t you uninstall a .deb without running a custom uninstaller script included in the .deb?”…