I recognized this a couple years ago at a startup I work with. Comparing Google Analytics numbers to validated event logs, the numbers were off by ~20-30%. Su

I recognized this a couple years ago at a startup I work with. Comparing Google Analytics numbers to validated event logs, the numbers were off by ~20-30%. Surely there must be a quick workaround I thought, there's no way there's an entire multi-billion $ industry of 3rd party analytics software giving bogus numbers to websites?! But that's indeed the case. I immediately made top priority building out an in-house analytics platform where event logs were sent via the API and thus didn't get blocked. And for those saying relative direction is all that matters, I guarantee you the behavior of users with adblocker installed is very different from those who can't be bothered or don't know how.