IodeOS has a Settings page that allows you to uninstall any of the pre-installed apps, including the microG components. If you select to uninstall an app, it is uninstalled the next time you reboot.
I assume it uses the same mechanism as the adb uninstallmethod of removing system apps (See this thread), as you can choose to re-install it from the same settings page. When an app in ‘uninstalled’, the app .apk file is still present in the devices storage, but it cannot be run, until you reinstall (using the settings page, or adb) and reboot