What the U.S. considers a practical problem often isn't. That is a shitty statement. The U.S. also considered spending 2T on a jet that was worse than the F-22. Just because the U.S. spends on something doesn't mean it has a practical application.

Nevertheless, the internet turned out to be transforming from its original purpose. We can sit here and argue about cyrptocurreny but the game is young and we wont know what it will turn into in 30 years. Just like the people in the 70 and 80s didn't know how transforming the internet would become for our society.