Some of the world's largest advertisers – including PepsiCo, Unilever, Adobe, L’Oreal, Nestlé, Honda, Samsung, Paramount+ and the US Department of Homeland Security are among those mired in allegations that their ads were served on websites containing child sexual abuse. Those accused of failing to spot the warning signs and involved in the supply chain include Google, Amazon, Microsoft, Outbrain and others along with ad verification services monitoring brand safety and ad industry standards bodies including the US-based globally influential Media Ratings Council and TAG. Now US Senators have waded in and want answers. Former UM privacy chief turned watchdog at Check My Ads, Arielle Garcia, thinks the fallout is only just starting.