The fun part is, as far as I understand it, the EV tax credit as part of the Inflation Reduction Act, did eventually include Teslas - even though Elon wasn't invited to the initial photo-op announcement party thrown by the White House due to the lack of unionization at Tesla factories.

On the flip side, support for the EV tax credit will probably be phased out if Trump wins according to recent articles I've read.

So then it seems it's not necessarily business logic but more about personal ego, etc.