Silicon Valley, the innovation hub of the world and home to some of the most successful tech companies, could soon turn into a ghost town — at least that’s the dire warning from billionaire hedge fund manager Bill Ackman.  “It would be catastrophic to California,” Ackman told The Post. “Every successful founder, entrepreneur would leave....

California isn't adopting Trump's federal "no tax on tips" policy, and cash-strapped service workers are not pleased.