He was the nerdy tech titan who impacted everyone’s daily life, but no one knew who he was. Yet Google cofounder Sergey Brin has suddenly burst on to the scene and transformed into a political powerhouse — and many think it’s due to his girlfriend. Despite his escalating war with Sacramento — mainly over the state’s crippling billionaire tax — little is known about the billionaire’s private life. Brin has quietly traded Silicon Valley’s liberal bubble for a far different backdrop — a sprawling Nevada hideaway perched on the edge of Lake Tahoe, just beyond California’s tax reach. Yet Google cofounder Sergey Brin has suddenly burst on to the scene and transformed into a political powerhouse — and many think it’s due to his girlfriend. Getty Images for Breakthrough Prize Sergey Brin’s girlfriend Gerelyn Gilbert-Soto pictured with President Donald Trump in May 2025. Instagram/GG He shelled out a reported $42 million for the cliffside estate, according Realtor.com.…