Carbon trading is the "free market" solution to getting businesses to price-in what would otherwise be a free externality.
I won't praise Musk for it (at best praise goes to the governments setting up the rules), so we're probably on the same page, but it did feel like you were painting him as a villain for taking part in something that at least solves one of the common criticisms of carbon emitting industries.
Not exactly, the "free market" solution would be a carbon tax. The distinction matters here - had Musk not sold Teslas offsets, those other businesses would have paid a higher (and more accurate) price.
It may feel like that because it takes away Musks "at least he built the Autobahn" (even though the statement is of course also inaccurate for the original). But I consider it very dishonest to assign CO2 savings from electric cars to him, without also mentioning him profiting off of those emissions in other places.
