Hey look, it's Slashdot concern trolling their readers again!
I reject the premise.
"Why are software developers working on this trivial Internet thing rather than solving world hunger?"
It's the Von Mises knowledge problem, aka the economic calculation problem. You don't know what the most important problems to solve are because you (and by "you" I especially mean "any government body") can't see the future. One person can only be an expert on their own life, not everyone else's lives. You don't necessarily known what the real biggest problems today are, because when you read or watch the news you're watching edited abstracts of selections of other people's limited knowledge, with biases conscious and unconscious at every step of the process.
You have no way of known that specific technology you're working on won't have far greater benefit to society than whatever our cultural elites have decided to focuses on for clickbait concern trolling this week, especially ones with easy emotional appeals ("Show me rain forests! Show me police killing black people!") rather than more difficult or abstract ones ("Show me how deficit financing eventually destroys economies!").
It turns out that creating the Internet probably did more to help solve world hunger than, say, studying how to make krill into food patties.
Work on the problems that interest you and that you have the capacity to solve, not what other people think are "more important," because there's a good chance they're wrong.