You can find some case studies here: https://www.pingcap.com/success-stories/

Specifically full case studies: https://www.pingcap.com/success-stories/tidb-in-iqiyi/ https://www.pingcap.com/success-stories/tidb-in-zhuanzhuan/ https://www.pingcap.com/success-stories/tidb-in-eleme/ https://www.pingcap.com/success-stories/tidb-in-mobike/ https://www.pingcap.com/success-stories/tidb-in-yuanfudao/