Musk is mostly not tying up free cash to buy Twitter, it's going to end up largely being a debt move (as is typical of what he does, as he hates to sell his stock).

And I'm not sure where your premise matters re what I said. Tesla is the entity in question with the booming free cash to spend from operations, as their business has become soundly profitable. If Musk leverages his enormous net worth on acquiring profitable Twitter - what does that have to do with Tesla's ability to direct its operational cash to robotics R&D? Maybe his focus being split further will increase the risk to Tesla's profitability over time, however you didn't suggest that (and maybe Tesla would be better off with a Gwynne Shotwell operating it anyway; a more distracted Musk that has to hire a superior operator might bolster Tesla).

With $3.6b in operating income last quarter, and $9.6b over the last four quarters, Tesla increasingly has huge resources to throw at big R&D programs. Which has little to nothing to do with Musk's personal finances.

SpaceX, as per Musk, has a decent chance of going bankrupt. Perhaps he was just saying that to guilt people into come in to work over Thanksgiving which raises an entire other collection of concerns.

So far Tesla Robotics hasn't shown much to make anyone think they are serious about it. He needs to run his companies like an adult and stop doing stupid stunts for attention and taking stupid risks like smoking drugs one of your most, if not the most, profitable customer says are illegal on camera.