I'm afraid BABY have done this with their AMS route....
Not sure they have. Baby's passengers are, I would bet, going to AMS, while KLM's are typically going via AMS to somewhere else.
In any case, KLM would have some influence over AF, and may well (if they have any sense) stop them doing a CWL-CDG. Baby are a law unto themselves from a KLM/AF perspective.