Aren't Angels, Seed focused VCs and incubators essentially patrons? In many ways the modern patron of the arts is the Angel investor funding technological arts that may never become viable businesses.
Now, this doesn't stop a company or VC from acting like a patron. We've seen a number of them release open-source software, publish papers on working strategy/tech, sponsor R&D that is similarly public, and so on. I'm not sure what the percentage is but it shows the models aren't exclusive. It's just the incentives shift VC stuff far in another direction from Da Vinci or Michelangos making goods for the public. Really far per some billionaires. ;)