Tag Gateway Serves Tags From Your Domain — But Your Data Still Goes to Google
Google Tag Gateway serves measurement tags from your domain, improving first-party cookie classification — but all collected data still flows to Google’s servers for processing, not your own infrastructure (Louder, 2025). First-party cookies and first-party data are not the same thing. Cookie classification determines how long a browser keeps the cookie; data sovereignty determines who owns and stores the information it collects. WooCommerce stores that want true data ownership need server-side tracking that processes and stores data on their own server before forwarding it to any platform.