Thinking meat! You're asking me to believe in thinking meat!

I don’t understand how “Twitter is controlled by the government” is the simplest explanation. Do you actually use Twitter?

I feel like Twitter had an outsized representation along social media giants. It’s one of the smallest by MAU; and has a history of management problems. Isn’t occans razor here that is just a poorly run company?

Occam's Razor has nothing to do with this, and its improper invocation is fallacious. Literally it means "do not multiply entities beyond necessity"; in practice it's also called the principle of parsimony, meaning that one should not assume a more complicated explanation when a simpler one will do. Positing a connection between Twitter and the US government, without supporting evidence but just because it "makes sense" - is anything but parsimonious. That remains true even if such a connection does eventually turn out to exist. "Do not attribute to malice that which is explained by incompetence" is likely to be the more applicable principle here.

Controlled how?

I ask because I'm pretty sure real (non-US government) people post to Twitter and get real retweets. How is the US government controlling it?

I imagine this would have blown wide open a long time ago if true. (Also Occam's Razor?)