Analytics are collected via proxy links. When viewers click on a link on your profile, instead of being sent to the real link, they are instead sent to a URL like https://lksg.me/click/5d9948b2-d583-4427-970b-637ebdb1f055. When this page is viewed, a "click" is recorded (after a test ensuring the click is not from a bot), and then the viewer is redirected to the true link.