They're not really though.
Brazil's complaints are about misinformation being actively spread on the platform, andTwitter not only failing to moderate it on their own, but refusing to moderate when the accounts are specifically pointed out either.
The TikTok ban fundamentally goes back to the Chinese government controlling the company. Regardless of what TikTok and the government claims, only an idiot would believe they don't have control over a social media platform based in China. Even if the servers are US-based, the Chinese government will have access whenever they want.
Put the newest intern in charge for a year. They couldn't do much worse than the last 4 CEOs, and would be much cheaper.