Elon Musk is facing a challenge in his persistent pursuit of reducing expenses at Twitter: some of the vendors that Twitter is pressuring to cut costs are also its advertising customers. According to two sources familiar with the matter, Twitter's sales and marketing team were informed by their colleagues in the past month that Amazon had warned of withholding payment for its advertisements on Twitter as the social media platform had been delaying payment of its Amazon Web Services bills for cloud computing services for several months.
