Metro.co.uk modifying your copy/paste behind the scenes

Just found out that trying to copy text from an article at metro.co.uk will automatically be appended by a bunch of links to facebook and twitter.

Anyone seen this kind og anti-user behaviour in the wild before?

https://metro.co.uk/2019/01/10/grand-tours-jeremy-clarkson-horrified-findings-detroit-season-3-episode-one-details-revealed-8328678/