A better car for most people is not just a chip upgrade. Anyone with a lick of sense has no need for more horsepower than whatever a standard EV has. It's beyond plenty for normal driving. I drive an Opel Corsa E which is a cheap EV and it accelerates more than fast enough. Upgrading would be about better safety equipment, better range, more space, better seats, better sound system and stuff like that. None of that can be done with a chip. It would be a different car, which is what I plan to get in a few years.
Paying for a horsepower upgrade chip is something very few people have any interest in doing. Mostly irresponsible assholes who are a danger to others, maybe a few people who need it to pull trailers or something.