Using internet in 21st century not only Has made life easier but also it Has made many people billinior. Mark zukerberg the founder of Facebook is one of the strong example.
Google, ebay, amazon are billion company Because of internet. And many more example we have like this.
So as a individual we have also chance to make some money using just internet. Advertisement publisher or freelancer can make thousand of dollar per month.
Google adsense and other company Has given such Opportunities.