YouTube refers to it as "invalid click activity" when they demonitize channels for it. In some instances, fans of one channel/creator have been known to brigade

YouTube refers to it as "invalid click activity" when they demonitize channels for it. In some instances, fans of one channel/creator have been known to brigade the channel of someone they don't like and click the ads many times, which YouTube will assume is evidence of the target trying to artificially inflate their own revenue.