First off, not everyone uses wife, but most people do. Some people are even required to use it for their job. However, as previously stated, this costs money. And some people might not have enough money to use it outside of work, because they are either poor or because the money is going somewhere else more important. Usually this is fine with a data plan, but people would probably want to save their data and use the free stuff instead. But that would require them to get an Internet plan and a router, which, again, might be too expensive for some people.