The OS puts Candy Crush in your menu and it's installed on demand. So to users it will seem like it's always been installed.
All the pre-installed software is my big pet peeve for Windows 10. I don't want weather, or contacts, or xbox, or 3d builder, or email, or alarms, or skype, or office, or calendar, or groove, or money, or news, etc... I've deleted them and they just come back because of some provisioning setting.