What do Google’s terms and conditions say about fake clicks / non-human clicks?
Google prohibits clicks that do not arise from genuine user interest and describes them as invalid clicks.
Although they screen invalid clicks and offer refunds months later, they also allow the use of third-party tools to screen and block them where necessary.
Read the full article here. Google has also listed ClickPatrol as a certified click tracker for tracking and detecting invalid clicks. See the full list here.