bit.ly and t.co both do, and they're hugely popular. I just left the HTTP responses out of the post for brevity. From the post: >While neither redirect you to

bit.ly and t.co both do, and they're hugely popular. I just left the HTTP responses out of the post for brevity. From the post: >While neither redirect you to an advertising company like TinyURL, Twitter’s primary business model is advertising, and bit.ly’s privacy policy says they share data with third parties to “…provide advertising products and services…” Both services set long-lived tracking cookies: curl -v 'http://bit.ly/aFzVh0' ... < Location: http://nymag.com/daily/entertainment/2010/08/hear_katy_perrys_milk_milk_lem.html < Set-Cookie: _bit=l03lLp-b899a3350a02095760-00P; Domain=bit.ly; Expires=Fri, 02 Jul 2021 21:47:25 GMT curl -v 'https://t.co/45cMiYOHQ8' ... < location: https://luke.cat/ < set-cookie: muc=6d0d0800-f738-4704-b292-f03b6e5a5f91; Max-Age=63072000; Expires=Tue, 03 Jan 2023 21:49:09 GMT; Domain=t.co; Secure; SameSite=None