We work with thousands of on-demand service businesses from all over the world (Locksmiths, Plumbers, Repair, HVAC, Waste removal, Pest control and many more). We have noticed that on-demand services are ripe with fraud and are extremely competitive industries. That is why we recommend going with a an extremely aggressive fraud blocking strategy of 1 click to block.
Cost per clicks are sky high, competition is fierce and the time to conversion is fast.
Since, the majority of legitimate leads will give you a phone call after the first paid ad click there is no reason to allow someone to click on your ads a bunch of times and waste your budget. By setting an aggressive click fraud threshold of 1 click, you are eliminating the chance of spam and allowing your money to reach way more potential users instead of the same guy clicking over and over again.