I didn't say that there were too many for my liking, be fair. The point I was trying to make, probably clumsily, is that adverts are no longer representative of modern day society. Do you really believe that the seller decides on the make up of adverts based solely on its target audience for sales? I have several friends who work in the advertising area and I know for a fact that there are more factors at play that that.
You do have a point. Yes, I suspect that some sellers think that a bit of virtue signaling may help sell a product. However the decision making will be entirely driven by what is deemed cost effective, to maximise sales. But that hardly constitues always selecting the black bloke when two equal candidates apply for he job, which is what you appear to be suggesting. And invoking this as the archetype of Political Correctness Gone Mad (implied if not explicitly stated), and connecting this to a decision to not warmly embrace Blyton (a decision taken in the 1950s) is, if I may say so, outré.