Viva! Vegan animal rights group based in the UK have had their bus ads banned! Sources: https://www.ncbi.nlm.nih.gov/pubmed/29467955 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3357167/ https://www.telegraph.co.uk/news/2018/05/15/vegan-groups-advert-wrongly-linking-cows-milk-cancer-banned/