As I understand it, the $7.5k isn’t any EV, but EVs that were assembled/built primarily in the US. Many weren’t compliant with that legislation. Not out of spite or anything, but because manufacturing wasn’t quite ready to comply. That led to a number of vehicles sitting ineligible for the 7.5k break. As well as consumer confusion over which ones could be discounted. Overall, a transitional growing pain for a crappy industry that relies on monthly sales.