The overlords of Silicon Valley need to do a bit more to turn America's best minds towards solving serious social problems.
Personal anecdote: Right now, I am building software that automates the process of filing super-simple Chapter 7 bankruptcies. We give the product away for free.[1] Technologically, this is a really straightforward problem and solution: You just collect some documents and fill out a long questionnaire, fill out a PDF, show up to a couple of meetings, then you've discharged a bunch of unsecured debt and have a fresh start in life and the economy.
There should literally be millions of these Chapter 7 bankruptcies filed every year[2]... but nobody has built the software before! Despite its enormous potential impact and amazingly low cost (we have two full-time employees, though we could use more), nobody has really tackled the problem because there's no way to simultaneously get rich while building the most successful product.[3]
There is a crazy amount of low-hanging fruit out there like this. Much of it could be plucked by small, bright teams of the sort Silicon Valley has in abundance. The most powerful people just need to dedicate a little more money and 5-20% of their time to it - not just money, but serious, ongoing advice. [4]
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[1] https://Upsolve.org. The product is free and we're a non-profit because you trigger an avalanche of regulatory activity if you try to make money doing this. We've also been able to garner an incredible amount of institutional (judicial) buy-in because we are a non-profit.
[2] http://econweb.ucsd.edu/~miwhite/white-jleo-reprint.pdf
[3] Our #1 success metric is simply "number of Chapter 7 bankruptcy discharges received".
[4] Real advice - not sending it down the black hole of billionaire philanthropy. Without even getting into the subject of how those institutions grind their founders' personal axes, there is a huge qualitative difference between their advice and Silicon Valley-level "Let's build a huge thing on a lean budget" advice.