when was the last time you installed windows? Also, what version? If you've only ever had it set up for you, then you may have only used windows that had already been cleaned of all the bullshit. This includes pc s provided by your work.
For win10, the install iso provided by microsoft puts ads for games in the windows store in the default start menu. I have installed many win10 pc s over the years, and candy crush (among others) is always there.