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...It's been a rocky pairing since October, when Musk officially took over and many big-name advertisers paused spending on the platform. Almost five months later, the company's standing with the advertisers that historically make up 90 percent of its revenue still hasn't measurably improved.

More than half of Twitter's top 1,000 advertisers before the acquisition have stopped advertising on the platform as of February, according to data from digital marketing analysis firm Pathmatics and shared with Vox.

Out of Twitter's top 10 advertisers pre-acquisition, only six still advertise on the platform, according to the firm. That affects Twitter's bottom line: The company's revenue was down by 40 percent, according to a December report by the Wall Street Journal. Fewer people also appear to be visiting Twitter's website where advertisers create ad campaigns: The number of users visiting Twitter's advertising portal page was down 18 percent in February compared to a year before, according to data from digital intelligence firm SimilarWeb.

Vox spoke with several advertising executives, former Twitter employees, and other industry insiders who explained why Twitter's relationship with advertisers continues to suffer. ...