I have no private insight to his motives, but profitability / vanity / dozens of other motives seem a lot more likely to me than spending $44 billion to fix a censorship problem, even if that does make for (selectively) good marketing.
A week later (April 11th), he decided not to join the board because he wouldn't be able to exceed a 14.9% cap.
Three days later, he makes a meme-ish offer of $54.20 https://twitter.com/elonmusk/status/1514698036760530945
Side bit look at the stock prices and volumes - https://finance.yahoo.com/quote/TWTR/history/
---
I suspect that both the "this is the backout penalty" and the SEC looking closely at him for trying to manipulate the price of Twitter discouraged him from backing out.
He was able to use it as an opportunity to sell some other significant amounts of stock as part of the "I am going to buy Twitter" that he would likely have been able to keep as cash if he was able to successfully back out of buying Twitter (though he's containing to sell stock).
https://www.cnn.com/2022/11/08/business/elon-musk-tesla-stoc...
It was a terrible business deal if your concern was profit. Even Musk says he overpaid, and the previous investors of Twitter were clearly eager to get out of that investment, going to court to force Musk to buy it.
If you read the text messages between Musk and Ellison, which came out as part of the trial, Ellison was offering Musk basically any amount of money, a blank check. Why?
For those that think Twitter is going to crash, are you on the right?