yeah, i&#x27;d figure most large sites have automated processes for this too, often with at least some machine learning stuff.<p>doing the analysis and cancellations manually in excel, without backtesting, feels super irresponsible (she tested it in production!!)<p>&quot;How could Jenn be sure that the transactions she was canceling were fraudulent transactions? Jenn anticipated that legitimate customers would complain; however, she never heard from anyone whose transactions were canceled for this reason.&quot;<p>wat