Per the docs here [1], that is not true. You continue to load gtag.js off the googletagmanager.com domain; subsequent events can flow to a custom domain. [1]

Per the docs here [1], that is not true. You continue to load gtag.js off the googletagmanager.com domain; subsequent events can flow to a custom domain. [1] https://developers.google.com/tag-platform/tag-manager/server-side/intro https://developers.google.com/tag-platform/tag-manager/serve...