Comment by no_gravity

Let's take a look what the top sites according to Alexa do:

https://www.alexa.com/topsites

    Google: www
    Youtube: www
    Facebook: www
    Baidu: www
    Wikipedia: www

I see a trend here...

Would be interesting to go through the whole list and get a broader statistic.

Let's look at some of the newer/hipper sites on the list:

    Reddit: www
    Instagram: www
    Netflix: www
    Twitch: www
    Spotify: www

So all 10 out of 10 major sites I visited redirected me from the non-www to the www version.