Disc tint

Hello everyone, this is definitely someone with tint foils, according to the law at least 70% light has to pass through in the front and according to several forums/internet pages the light permeability of 70% of all cars should already be from the factory, with the green glass. How come that an S class (some also have normal windows) has the front side windows darker? There can be comments that it only looks like this on the photos, but no, in reality you can only see the driver half way egs, is that again out of the category, where the manufacturers have more rights than the normal people, like with the Klappennauspuff? Or can I have something like that registered legally on an x-any car?