Probably the same place you can buy an aftermarket CAN board and controller for your Volkswagen.

Oh, looks like cars and consoles aren't that different after all.

Except for the software ecosystem which is the main driver of revenue for consoles and exists largely to support the sale and distribution of products from third parties, all of which is centrally controlled by the platform holder.

Someone else in the thread made the comparison to fuel, I'll go with that. Last time I checked, there was no such thing as petroleum DRM.