Thousands of Amazon Flex drivers have filed arbitration claims against Amazon, alleging that the company's classification of them as independent contractors instead of employees has resulted in unpaid wages and other financial losses. The claims, submitted by drivers in California, Illinois, and Massachusetts, argue that current laws in these states require them to be classified as employees. If successful, this change would allow drivers to collect unpaid wages, receive overtime pay, and be reimbursed for work-related expenses. Amazon's business model for its driving workforce, which includes independent contractors and third-party businesses, is facing scrutiny and challenges from various sources, including a bipartisan group of senators and the Teamsters union. [Extracted from the article]