It's interesting that the worlds most popular operating systems, Windows, iOS, and Android, use almost zero FSF software (the "system"), although much of Android is GPL licensed.
Whether or not Android and iOS use FSF software, they do use software that was inspired by what the FSF pioneered...
It's interesting that all of these OSes are provided TOGETHER with the machines they are sold with and therefore completely remove the possibility for the user to "choose" something else. Of course on a PC you can always install a Linux distro, but it's not like most consumers know about it.
While Linus himself nowadays actively speaks out against GNU, he still use GNU's license and GNU's software (gcc and glibc), so even in Linux alone, without the GNU userland, we see some influence of GNU on Android.