I can see them as a shared fate for a couple reasons:
* the obvious one is Elon - both valuations are largely propped up on belief in Elon. Whenever he falters, his companies that are speculation-based (all of them) will take a hit
* Elon pitched SpaceX as an AI company. Tesla needs better AI because they keep sending signals that they won't be at L5 anytime soon, and Tesla's valuation is still very speculative[0]at least in part due to the race to L5 autonomy. i.e. Tesla will need better AI , and SpaceX is that natural fit (on paper, at least, I'm not sure SpaceX has any useful AI for any use case, let alone self-driving).
[0] Tesla's PE ratio of is still 30x massively out of line with it's actual earnings and ~30x the American automotive industry.
* the obvious one is Elon - both valuations are largely propped up on belief in Elon. Whenever he falters, his companies that are speculation-based (all of them) will take a hit
* Elon pitched SpaceX as an AI company. Tesla needs better AI because they keep sending signals that they won't be at L5 anytime soon, and Tesla's valuation is still very speculative[0]at least in part due to the race to L5 autonomy. i.e. Tesla will need better AI , and SpaceX is that natural fit (on paper, at least, I'm not sure SpaceX has any useful AI for any use case, let alone self-driving).
[0] Tesla's PE ratio of is still 30x massively out of line with it's actual earnings and ~30x the American automotive industry.