For thousands of American families, an unexpected medical bill can become a financial burden that lasts for years. A hospital visit, an emergency ambulance ride or treatment for a serious illness can leave patients struggling to pay their bills long after they have recovered. Now, a major philanthropic contribution from Snapchat CEO Evan Spiegel and his wife, model and entrepreneur Miranda Kerr, has helped ease that burden for more than 261,000 people in California. The couple supported Undue Medical Debt, a nonprofit that purchases medical debt at reduced prices and cancels it for people facing financial hardship. Their work has helped erase more than $550 million in medical debt, providing some relief to families struggling with…

