One of the most common ways it is perpetrated is via PPC fraud, in which website owners use an automated clicker, or click bot, to focus on Google Display, YouTube, or responsive text ads on their own site.For example, until it was prohibited, publishers were able to style their ads with colors and fonts that caused them to blend with the webpage layout, blurring the difference between advertising content and regular content, resulting in clickthrough rates as high as 50% and the revenue was paid to the publisher, meaning the advertiser was charged.Another example of how Google was reactive is that there was a person in the early days who was known for their click bots who partnered with people to revenue share ad clicks.This person got away with it for quite some time.”This reactive approach has left Google scrambling to catch up as click bots develop new strategies and workarounds.According to Musk, Twitter undercounted the number of fake accounts on the platform by millions, a claim that was lent credence by testimony from Twitter’s former head of security Peiter Zatko, who claimed executive bonuses were tied to daily user numbers."