After having seen The Great Hack https://www.imdb.com/title/tt9358204/ over the weekend, it's hard to imagine how the scope expanded again. They used the developing countries all over the world as practice for UK brexit and US's 2016 elections.
Is there any rock solid evidence around this yet? As far as I'm aware it's still in the realm of conspiracy theory. Given how far she's spun hearsay, circumstantial evidence and speculation, I'm betting if Carole Cadwalladr etc. did have anything concrete we'd never hear the end of it.
It sounds like the management/salespeople of CA have been telling potential clients that they could affect election results whether it was true or not.
I don't have evidence for Brexit, but I did personally witness a similar operation in a 2014 Senate race where the data made clear that this wasn't something organic, or small scale (think orders of magnitude). While I can't tie direct to CA if they were leaders in the space there's no reason to believe they weren't using the same playbook, and more.