Google co-founder Sergey Brin has once again opened his wallet - not to pay taxes, but to fight them. According to a new filing, Brin has donated an additional $20 million to Build a Better California, a group opposing the state's proposed billionaire tax. That brings his total spending to over $100 million, all in service of avoiding an estimated $13.3 billion tax bill. Because why pay $13.3 billion when you can spend a mere $100 million to try not to? That's savings, people.

California's Prop 40, affectionately known as the billionaire tax, would impose a one-time 5% levy on the net worth of the state's approximately 200 billionaires. The proceeds would mostly fund healthcare programs, which are about to take a hit: California's Medicaid program alone could lose up to $30 billion in federal funding once Trump's budget cuts kick in next year. So, you know, the money would actually go somewhere useful.

Brin, the world's fourth-richest man with a net worth hovering around $267 billion, isn't the only tech mogul fleeing or fighting. Meta's Mark Zuckerberg reportedly snagged a $170 million mansion near Miami this year - because nothing says 'I'm not fleeing taxes' like buying a house in Florida. Former Uber CEO Travis Kalanick, venture capitalist Peter Thiel, and Brin's fellow co-founder Larry Page have also left the state. They're all in favor of tax avoidance, it seems.

Governor Gavin Newsom (D-CA) is less enthused about the exodus, worrying about the economic impact of billionaires fleeing. He's proposed a 'national billionaires' tax' instead. 'Today, the office worker can shoulder a higher tax rate than the heiress,' Newsom wrote. 'We should end the 'tax-free lifestyle loan,' the gimmick that lets the ultra-wealthy borrow against their stock portfolios while reporting no taxable income.' Because nothing says 'fair' like a billionaire paying a lower effective tax rate than their assistant.

Californians will vote on Prop 40 in November. Brin's funded organization is pushing opposing ballot measures that could block the tax by limiting new tax introductions. Meanwhile, Nvidia co-founder Jensen Huang - apparently the working class hero we never asked for - says he's 'perfectly fine' paying the tax. Huang, who'd owe around $8 billion, told Bloomberg in January, 'I have not even thought about it once. We chose to live in Silicon Valley, and whatever taxes they would like to apply, so be it. I'm perfectly fine with it.' Someone alert the media: a billionaire with a conscience. Or at least one who doesn't mind paying his fair share.