Logan Paul
Logan Paul published a video to YouTube that showed him walking through Japan's "suicide forest" and showing footage of a dead body hanging from a tree. He was also cracking jokes the entire time, and the extremely disrespectful clip earned him some major criticism. He apologized and said he was only trying to bring awareness to suicide prevention, but many people found that hard to believe. YouTube suspended his ad revenue, one of his biggest sources of income, after that.
Anthony Fantano
Anthony Fantano, one of YouTube's premiere music critics, was put under fire after it was discovered that he was behind an alt-right channel called thatistheplan. It's like 4Chan and has content that rages against women and SJWs. Even though his channel, The Needle Drop, is so successful, people weren't sure about his character anymore and he lost 400,000 subscribers.