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You have to server side tracking or you lose 20-60% of your data.
The best part is you never know which day is 20% which day is 60%, or which direction the errors are in.
We have a massive under adoption of server side tracking in the market due to advertisers and agencies having no clue what their data actually says.
They just run whatever report they know how to find then make up stories about what the clicks are doing.
