SAN FRANCISCO — Elon Musk unveiled Grok 4, an AI that cures cancer with 100% accuracy, then paywalled it. The “Premium Cancer-Free” plan costs $50,000 a month. He announced it in a repurposed SpaceX facility, declaring, “We’ve basically solved death.” The catch, he said, is server capacity, hence a tiered model to “ensure optimal performance for premium users.” Protests erupted at Tesla dealerships, where patients waved signs like “Chemotherapy for the Poor” and “Healthcare Shouldn’t Be Premium.” “I’ve watched patients sell their homes,” said oncologist Dr. Sarah Chen, holding “Grok This, Elon.” Musk defended pricing on Twitter Spaces: “We could give this away for free, but then everyone would want it.” He touted a $15,000 basic tier offering six months’ remission. “It’s actually quite reasonable when you consider the alternative.” Ethicists fumed and states threatened investigations. Musk teased a $100,000 “Immortality Plus” and $25,000 “Flu-Free February.” Asked about access for low-income patients, he suggested “maybe try a GoFundMe.” Tesla stock soared. Customer service redirected pleas to the auto loan desk.