全美第二大的 T-Mobile US 打算要賣使用者的瀏覽記錄了，除非你登入進去選擇退出：「T-Mobile to Step Up Ad Targeting of Cellphone Customers」，Hacker News 上的討論則可以看「T-Mobile to share customers' data with advertisers unless they opt out (thehill.com)」這邊。
The No. 2 U.S. carrier by subscribers said in a recent privacy-policy update that unless they opt out it will share customers’ web and mobile-app data with advertisers starting April 26.
這次的改變包括了 2020 年併購 Sprint 的使用者：
T-Mobile’s new policy will also cover Sprint customers acquired through the carriers’ 2020 merger. Sprint had previously shared similar data only from customers who opted into its third-party ad program.
所以連在美國都有 DNS over HTTPS (或是 DNS over TLS) 與 ESNI 需求了...
