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he even bought it with cash, for 630 trillion, not a small amount of money for a platform,
I don't see any reference anywhere on this. And I'm not sure that it's easy to monetize his fortune that much. There will be a lot of inequality that affects his companies due to the fact that most of Elon's wealth is in liquid assets, not cash.
And I found this information:
In Monday’s statement, Twitter said Musk is providing about $21 billion and has secured $25.5 billion of debt and “margin loan financing,” adding “there are no financing conditions to the closing of the transaction.”
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sourceHe didn't fully use his wealth to plan to acquire twitter.