I don't have nearly enough visibility on the political process of other countries to comment. I can only extrapolate by observing that Cambridge Analytica's core business value (harvesting personal data, using it to build a political profile, and microtargeting ads based on that profile) was functionally no better than just "spending more on advertising" in the American 2016 race. So I put burden of proof on those who claim otherwise to show that CA had meaningful influence in any other race.

It would be more surprising to me if they were uniquely unable to build a working psychological profile of an American voter versus any other voter then the simpler scenario that their entire concept was technological snake oil.

There are other countries? /s

As a professional advertiser who has worked in political ads, I can tell you it had no effect on any of the results of these campaigns. A bunch of bad people hired them after the Trump campaign because they bought the fluff too.

Noting that CA and their parent company SCL were working on elections for years before the Trump campaign.