The reason we know about Cambridge Analytica is because of some British investigative reporters posing as Sri Lankans hoping to recruit them for a campaign. That is, our information about what other organisations like Cambridge Analytica do is fragmentary. We don’t know if the Clinton campaign acted similarly. We don’t know how they affected campaigning in Australia. We don’t know if they harvested data on Australians, or sold that data to Australian politicians, or their electoral campaigns.
The reality is, there is no way of truly knowing who is spending what when the information being generated is inserted into the bloodstream of the internet.