It's easy to look at Musk's tweets and think he's just doing buying in so he can shitpost more effectively, but he is savvy enough to realize that Twitter is not nearly as valuable as it could be. Its reach is as huge as any network and anyone with a public presence "has to" be on it.

The big knock against it is that users and brands are afraid of spontaneous howling mobs. Fewer users means less reach and fewer brands means less $$$. My guess would be that he has some ideas about how to change this. Maybe (spitballing here) more tools for users who are QT'd?