I don't know where you get that % but according to this:

https://www.internetworldstats.com/stats.htm

The World right now is at 54.4% in terms of internet users, there are people that use computers that cannot access the internet but you cannot access the internet without computers(smartphones and gadgets are computers). Bitcoin is still young and more people will eventually get internet access in the future. We don't have to let all 7+billion people of the world to use crypto or Bitcoin for it to be deemed a success.