Amazon is facing a collective lawsuit from British retailers, who allege that the online marketplace misused their data to boost its own market share and profits. The lawsuit, valued at one billion pounds ($1.3 billion) or £1.1 billion, claims that Amazon used non-public data provided by small sellers to offer cheaper rival products directly to consumers. This has led to a significant impact on the sales and profitability of the affected retailers. The case, described as a 'watershed' moment, highlights ongoing concerns regarding data privacy and competitive practices in the e-commerce sector. The lawsuit follows a recent wide-ranging settlement Amazon reached with the UK competition watchdog over how it uses Marketplace sellers’ data.