If it were me, and the true intent was to distribute the Tesla patents as widely as possible, I would have said "Tesla pledges to license its entire patent portfolio, on a worldwide non-exclusive no-royalty basis, to any interested party. We will ask for consideration in the amount of $1 for a 99 year license. Your lawyers and accountants can reassure you that these sort of symbolic commitments hold up in court. They'll also no doubt ask to see the full terms, which are about as boring as you'd expect, and which are available from our Legal Department."
I'm saying that management of Tesla isn't acting like a naive college kid giving away the store. There is a strategy. And the other auto companies will see it for what it is.