https://www.vice.com/en_us/article/akeq78/elon-musk-lands-hot-ad-client-for-twitter-himself

As advertisers have begun to flee Elon Musk’s chaotic Twitter, Musk has secured a major new client: himself. CNBC first reported that Musk's SpaceX ordered an advertising package from Twitter to promote SpaceX's Starlink satellite service in Spain and Australia. Musk confirmed the deal on Twitter, but said it was “not large,” and intended to “test effectiveness of Twitter advertising in Australia & Spain.”

The ad campaign, called a “takeover” by current and former Twitter employees CNBC spoke to, typically costs upwards of $250,000 and allows a company to put their brand atop Twitter's timeline for an entire day. SpaceX’s ad buy costs upwards of $160,000 and users will see Starlink promoted for the first three times they log on to the Twitter app when the takeover campaign is active in those countries.