Well, it might be huge in advertising terms, but it's pretty small beer in corporate debt terms. It might eventually be worth $250k. This is about 0.025% of the interest payments on the debt Twitter recently took on when Elon Musk bought it, which is peanuts. Not only that, but SpaceX also bought advertising from Meta and Google and I believe and the target seems to be legitimate - promoting Starlink in Australia and Spain.
If any of Musk's companies is going to bail out Twitter, it's going to be Tesla. Musk owns SpaceX: he's not going to use his own money to bail out his own company.
It isn't that this ad buy will hurt SpaceX by the money it costs; it's the willingness to self deal in a way that's clearly bad for one company.
The 'silo' that SpaceX has been able to keep itself in, staying isolated from Musk's other crankness. Countries, the DoD, and organizations needing launch services can look at SpaceX's merits more or less on their own. This took a hit, a substantial and fully deserved one, with is StarLink attempted rugpull. The international community let them pollute our LEO environment with tons of craft on the promise that affordable global internet access would be sustainable because of it.
Then the dudebro sadclown decides that, no, actually now that he wants Ukraine to capitulate the price of this will not actually sustain on it's own. Either he was lying as an excuse to leverage his control of the connection to get the outcome in a
war that he wanted, or StarLink was going to hold LEO hostage with the sunk cost of 'well if you don't want this to be for nothing governments of earth, better subsidize my company more!'. Now the DoD has to ask how safe their payloads are with someone willing to do either of those things. And if he wouldn't just cut off if he doesn't like something. Suddenly you have government restarting their own projects for global data access.
Now you have the heavily subsidized and invested in company getting messed with to support Musk's other bad choices in other companies. How long can anyone in the aerospace sector ignore how unstable Musk's actions are? Not long when impacts are demonstrably there. Twitter is a bad ad buy right now, so why go with it?
This, Space X in one thing, however much o you dislike him you have to give Musk some credit for.
He might drag down his whole empire.
I used to give Musk some credit for SpaceX but the more I've learned about it the more I'm convinced that it has been successful
in spite of Musk. Their insistence on burning out fresh talent like he wants causes a lot of problems and is overcome by going on work
purchased from better, smarter, companies with reasonable working standards. The mitigating factor of aerospace people being obsessive anyway helps too.
It's also been doing relatively well because it doesn't have as much political interference as other organizations have to deal with. That wasn't a brilliant move by Musk. That just happened.