Because reconciliation across sessions and platforms is non-trivial. Especially with browsers become increasingly adversarial (aka pro-privacy). https://www.qu

Because reconciliation across sessions and platforms is non-trivial. Especially with browsers become increasingly adversarial (aka pro-privacy). https://www.quora.com/How-can-I-reconcile-Facebook-advertising-sales-reported-by-Google-Analytics-with-Facebook-2-5X-difference https://www.quora.com/How-can-I-reconcile-Facebook-advertisi...