a) I would trust Karpathy over Elon given he doesn't have a competing product.

b) Apple only provides information to ChatGPT when the user consents to doing so and the information is only for that request i.e. it is not logged for future training.

The temp around Elon here is lower than you think. I would say almost the exact opposite of your claim.

Elon is talking out his arse as usual.

He is factually wrong and has been rekted by his own community notes