For the avoidance of doubt, they do not automatically match up TV licences to your BBC iPlayer account. When you go to the website to watch a video, you are redirected to the login page. From there, you are asked whether you have a TV licence, and only then does the video start. I can only assume the forced login is to enable user tracking?
I don't mind paying the TV license fee as the content is excellent, but I browse the website and download what I want to watch with youdube-dl, because I categorically reject their creepy tracking, which they refuse to properly explain. If youtube-dl stops working, I'll keep paying the licence to support the programming, but will look for torrents of the shows to download instead.