Fortune reports Google cofounder Sergey Brin has given $102 million to a group opposing Proposition 40, a November ballot measure for a one-time 5% tax on California's roughly 200 billionaires, with most of the money going to the state's health care program. Brin could owe about $13 billion if it passes. Opponents have raised more than $187 million and supporters about $32 million. The r/technology thread (about 38,000 upvotes) is overwhelmingly critical of Brin.