I assume, like most options, the cost to Tesla would be substantially lower than the selling price. So, I’d think more like 2-3k royalty out of $5k sales price. More like 400-600 million per year (growing as sales grow), in exchange for $20 billion now. That looks like 2-3% interest rate without dilution or the risks of debt. And if it permits faster rollout of Y, Semi, and Roadster (and eventually, Pickup), it seems like Tesla easily makes back that money. Personally, I see the Semi (and commercial transportation in general) as Tesla’s biggest opportunity, and want them to disrupt this market as soon as possible.
It’s certainly a trade-off, and I prefer a world with no trade-offs, but that isn’t the world we live in. The alternatives are debt, dilution, or slower growth. I’m fine with Tesla choosing dilution or slower growth, and I assume they will, but this could be better.