No, your math is off. Apple as car manufacturer + established car manufacturer remaining independent = 2, net positive 1 manufacturer (Apple). If Apple purchased an established company, that’s a net 0. It also means letting a company that is already under scrutiny for being too big and anti-competitive grow even larger and enter a new industry through a purchase, not going to happen in today’s political climate.*
*Im not debating the merits of such scrutiny, just stating what the political climate is. If anyone wants to debate whether Apple is anti-competitive, too big, or whatever, do it with someone else.
But apple is not a car manufacturer now. So buying one would mean the market would have the same number of competitors that it had yesterday.