It seems strange to call Siri ubiquitous when smartphone penetration among teenagers is less than 50%

Ubiquitous is one of those words that are hard to quantify. "most people have one" is false; "most people know someone who has one" is true.

My scale would go: true, partially true, partially true and partially false, partially false, false.

Does this mean virtual experience software is more popular than the others, or that it's the most popular type of digital entertainment when you look beyond the others?

Both statements are wrong, at least according to the Economist, that put games just second to movies but above music. Again, ambiguity can't be used to make a false statement true...