Maybe all his companies are like this, it’s just the first one that’s been so public and shown his true colours.

I'm not going to look for it now, but there was a Twitter thread from last year that kind of talks about this.

Basically, SpaceX and Tesla are companies that grew up with Elon as an early investor, and have learned early on how to contain him. They institutionally have firewalls in place to keep him from wrecking the real work they're doing, like dedicated Musk-handlers that slow walk his bad ideas until he changes his mind a few days later.

Twitter basically had none of those institutional firewalls, and could not container him with company culture.