大数据杀熟

Became a major consumer-rights topic around 2018 after reports that Ctrip, Didi and Meituan were quoting different prices to different users for the same product. 杀熟 alone (cheating one's own acquaintances) is older slang; 大数据 updates it for the algorithmic age. Explicitly banned under China's 2022 Personal Information Protection Law.

Use as a verb phrase: 平台大数据杀熟 'the platform does big-data price discrimination'. The 杀 here is figurative ('to fleece'), not literal 'kill'.