I think this sounds more like some sort of fingerprinting attempt. It good to see that random access to these kind of resources fails due to new(er) browser controls. However, this does not mean that the fingerprinting actually failed. There is probably some way to determine if the request was denied automatically by the browser or manually by the user (e.g., time to get "response"), which is definitely something whi…
But since there is absolutely no consideration for privacy from corporations like Google or Facebook, I don't see the need to support their perverse business model.
If enough users participated in such schemes, maybe these privacy invasions would stop.