The revelations may be “the straw that breaks the camel’s back,” said Rishad Tobaccowala, chief growth officer for the Publicis Groupe, one of the world’s biggest ad companies. “Now we know Facebook will do whatever it takes to make money. They have absolutely no morals.” Marketers have grumbled about Facebook in the past, concerned that advertisements could appear next to misinformation and hate speech on the platform. They have complained about how the company handles consumer data and how it measures ads and its user base. But those issues were not enough to outweigh the lure of Facebook’s vast audience and the company’s insistence that it was trying to address its flaws.