The only issue is that Musk vastly overpaid for Twitter, but if he plans to keep it and use it for his political ambitions, that might not matter. Also remember that while many agree that $44B was a bit much, most did still put Twitter at 10s of billions, not the $500M I think you could justify.
The firings, which was going to tank Twitter also turned out reasonably well. Turns out they didn't need all those people.
Subscriptions: 2021 (https://www.reuters.com/technology/twitter-launches-subscrip...)
Community Notes: 2021 (https://blog.x.com/en_us/topics/product/2021/introducing-bir...)
Native video: 2012-2015 (https://en.wikipedia.org/wiki/Vine_(service) / https://en.wikipedia.org/wiki/Periscope_(service) / https://www.videonuze.com/article/twitter-unveils-30-second-...)
Musk buys Twitter: late 2022.
That leaves… Grok.
(side note: Birdwatch was a way better name than Community Notes)