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A comparison between the event counts in Google Analytics 4 (GA4) and BigQuery (BQ) indeed seems puzzling, because the count in BQ is frequently much higher. The two counts differ because they use different methods to count events. BQ gets down to the nitty-gritty, providing you with the most detailed count possible, also known as the “ground-truth” data. On the other hand, GA4 uses a more high-level approach and provides estimates, also excluding some sessions (like Google Signals) that are included in BQ. Unfortunately, Google didn’t design the two to match each other easily. So, even though it seems odd, what you’re experiencing is pretty standard.
