https://www.techradar.com/news/twitter-puts-cambridge-analytica-on-the-naughty-step-and-bans-it-from-placing-ads

Twitter says it doesn't want Cambridge Analytica's money, and has banned the research company from buying ads on its platform. CA, which was at the heart of the Facebook data scandal, received a ticking off for its business model, which "inherently conflicts with acceptable Twitter Ads business practices".

"Twitter has made the policy decision to off-board advertising from all accounts owned and operated by Cambridge Analytica," Twitter said in a statement to Bloomberg Technology.