Although it's not always perfect, Google takes internationalization seriously. Its websites are used all over the world. Having a nice font that supports every language simplifies things.
I18n on Android is seriously awful. For example, Android 5 shipped with an improperly escaped string in the French Canadian localization strings that would cause the phone to reboot in a loop if it was connected to a charger when opening the lockscreen. Even the latest Android version (Nougat) displays the battery as "24 % %" in the French localization, "Press power button twice for camera" has been translated to the near unreadable "App. 2x sur interr. pr activ. app. photo" (roughly "Prs pwr btn 2x fr cam.") and some of the localized strings are comically nonsensical.
