What I’m saying is that I don’t think Mercedes could sell a package - software or otherwise - that rendered the car non-compliant with emissions laws.
Third parties logically have more leeway. Some of the third-party downloaders I’ve seen have explicit warnings to reset to factory before doing emissions testing or taking the vehicle in for service.
Mercedes has long offered “hardware” upgrades in conjunction with Brabus as well as different sportier versions of most models, so refining performance for those that want it via software seems a logical step.
I actually drive a Mercedes, would I pay this? No but we don’t really have the the roads of traffic that warrants the need for fast acceleration, but I can certainly see it being useful in some locations for those that want it.
Just curious: is it possible to negotiate these payments at purchase? E.g. could you arrange for a few years of this subscription as an incentive to buy the car (in normal times?)