The Rockefellers, the Astors, etc funded public parks, museums, and libraries for the public benefit. Silicon Valley venture capitalists just charter helicopters for themselves when BART is shut down; screw the proles.
An interesting take on modern tech billionaires. Thankfully, it's a take that's entirely incorrect. Bill Gates alone has donated $28B to charity.
It's worth pointing out that Bill Gates, while his fortune is self-made, did come from a well-to-do family. His father is one of the most ardent advocates of keeping the estate tax in place.
Supposedly, part of the acrimony between Gates and Steve Jobs stemmed from Jobs perceiving Bill Gates as being more interested in philanthropy and noblesse oblige than in being a tech innovator, and Gates thinking Jobs lacked a sense of civic duty.