This ongoing social media spat between Tesla's Elon Musk and an uncredited artist is just the latest example of parties using publicity (and specifically social media) to leverage a position in "David vs Goliath" intellectual property disputes. The strategy is usually for a smaller business to embarrass a larger corporate into "doing the right thing". There's some reciprocal posturing from Musk in this case, but I'd be surprised it this didn't quietly settle with the artist getting something for his efforts.
In the Freeths IP & Media team we understand that a legal position doesn't exist in a vacuum. We consider all of the angles and regularly advise on reputation management and publicity issues, whether as risks or opportunities.
He said he was not looking for lots of money but wanted to be paid "adequately" and loved that his design was being promoted by Tesla.