From what i understand how people are abusing the system is using private proxies that reset every 24 hours a new ip allowing them to keep clicking and keep earning i seen it on tbn and hackforums.net as methods being sold.
Taking advantage of the feature mentioned above is not abusing but is solving market inefficiency. It is to the benefit of the publishers.
As for clicking scripts - we are not pay-per-click network so it shouldn't be a big problem. How many globally unique IPs do you think they can get during 24 hour period?
Well right now i know of plenty of places i got get 20,000 clean us ip's daily for like 20bucks a month.
And since google has changed to a new form of ranking basically mobile friendly over views because most the net isnt mobile friendly people should be more worried about not losing their rank on google do to old fasion code not views at the moment.
You can buy a list of 400k-900k daily switching ip's from companies also cost a lot but its making people bank.