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Their opt-out is here: https://www.xfinity.com/privacy/opt-out https://www.xfinity.com/privacy/opt-out Somebody on Ars linked to opt-outs for AT&T/VZ/MVNOs here: https://arstechnica.com/tech-policy/2021/03/t-mobile-will-tell-advertisers-how-you-use-the-web-starting-next-month/?comments=1&post=39728472#comment-39728472 https://arstechnica.com/tech-policy/2021/03/t-mobile-will-te...