Elon would be wasting his money. The rot goes all the way from the top down to the janitors.
All the worker bees would sabotage the platform. Imagine if you had a website and your webmaster screws with it so you can’t get emails or do business, etc.
Every single staff problem is fixable. It is just a matter of wil, money, and time. If I bought a thoroughly corrupt business, I would fire every single person, hire a CEO in my image, and rebuild the entire organization from the top down. I would not even retain the little old lady who runs the cafeteria or the groundskeepers. Everyone would be let go and have to reapply. The vast majority would not be rehired.
Musk doesn’t need the money. He can shut down Twitter cold for the duration necessary for a complete rebuild. He wouldn’t do that because he is such a smart businessman. I am just saying financially, he could afford to.