You don’t have to, what happens between a user and their browser is theoretically none of your business. But if you care about your users’ privacy, I see no rea

You don’t have to, what happens between a user and their browser is theoretically none of your business. But if you care about your users’ privacy, I see no reason not to send this header as there’s no defined value for you as a business (unless you plan to somehow try to retarget users who’ve visited your site based on guessing which cohort that potentially refers to).