what Putin might possibly have over Musk’s head

Well they both had connections with Epstein and have moved in similar circles- that whole thing smells like a long-running Kompromat operation targeting top industrialists and financiers, frankly.

As for Elon’s wealth making him untouchable? My dude, leverage is a thing and he is leveraging other people’s money and as such, he depends heavily upon those arrangements staying where they are. The interest on loan he took to fund the Twitter takeover (with other people’s money) is a lot, and whether or not Twitter can cover those costs is a very real question. This looks a lot like the debt traps Trump is in- they might both have money, but their money is tied up in assets it’ll cost them something to liquidate (and which they can’t readily get more of) and when that starts to look like cycling loans around to stay liquid, that adds up to pressure.