The BBC is not state funded, it's a public broadcaster primarily funded by the general public, via the (admittedly outdated) TV licence fee system. Although the media output for the UK is non-commercial, it does have commercial operations and interactions though and they are mostly centred around the content produced for overseas consumption. As this post is on the .com domain where the international content exists (and which runs ads), I presume it is part of the paid content side of things.