Agreed. Especially since he built the engine from scratch if I remember correctly. I would think it'd be legal under fair use? But I've heard of so many fan games going under from cease and desists. Maybe they just don't want to pay the legal fees to fight it? Especially if they're not making a profit from it.
Teslas stock has always been a bit fucky. Their market cap (total value of all their shares) is greater than Toyota, Volkswagen, Daimler, Ford, and GM combined. It's crazy inflated imo.