The billboard looms large over the mid-Richmond. For those who might have missed it, the brightly colored sign takes a swipe at the City’s response to the fentanyl crisis. Its banner teases, “That’s Fentalife!” The billboard is part of a $300,000 advertising campaign funded by Michael Moritz, a technology venture capitalist who is only the latest in a long line of business leaders willing to spend lavishly to influence San Francisco politics.