Cambridge Analytica has had many clients. What they do is based on the work of Daniel Kahneman, who won a Nobel Prize in 2002 and on others who have built on his work. The Micheal Lewis book is actually about when he met Kahneman. I don't think I'm muddled at all.
A good example of bias is mentioning Brexit and Trump as clients of Cambridge Analytica then saying it's not proven. You disagree with both of these, CA helped these, so CA are bad. Even if they were not clients. I think that's a smear wrapped in a bias! I'm not defending CA in any way - I would imagine they've done far worse than work on a Brexit campaign.
Cameron is a fan of Thaler and the Nudge Unit helped to raise the amount of tax collected really quickly and easily using some of his work, which I think is a good thing. Why is it bad that he was 'a fan'. Again, you're highlighting your own bias.
If you think the LP don't use this, you're wrong. From simple photoshopping of Liz Kendall with a Tory rosette during the Leader election in 2015 (which was Lansman) to very sophisticated videos.
Very happy to discuss behavioural economics as I did a module on this last year.