What surprises me more is how blatant it was. These rules were around for at least a few years before the initial charge in 2014, and it's not like WB had a fresh marketing team. They didn't give products, licenses, free showings of films, or anything of the sort (which I believe under the rules is still wrong). They actually gave cash. They should've known this would have been wrong.
Which begs the question: how much was the fine? If it was trivial, that would explain why WB did it; the marketing benefit would've more-than-offset the costs, fines included.