I'm guessing it must be because of some kind of deal between Microsoft and Financial Times. If that's so then probably there are also similar deals with other publishers.
(It says that it's more likely just an unintended side-effect of the mechanism that FT.com uses to let search engines like Bing or Google index their full articles.)
Edit:
ChatGPT seems to disagree with me:
https://chatgpt.com/share/8b85ea2f-86bc-4c63-91fc-e32482c8e5...
(It says that it's more likely just an unintended side-effect of the mechanism that FT.com uses to let search engines like Bing or Google index their full articles.)