GroupM, Maybe

GroupM is another majorly influential player in the advertising business that most people probably haven’t heard of. As far as we know, the company hasn’t told its brands to stop advertising on Twitter, but the threat is in the air.
Elon Musk promised on multiple occasions that he will unban Donald Trump from Twitter. According to the Wall Street journal, a dozen high-end luxury brands who work with GroupM told the company to pull their ads from Twitter if the ex-president is allowed to rejoin. GroupM’s clients include LVMH, owner of Moët, Hennessy, and Louis Vuitton, as well as a number of other blue chip luxury goods companies.