You may be missing the actual crimes.
You're right that the tools were hype, and that they didn't work. So why, despite knowing that Cambridge Analytica tools were useless, did Trumo keep paying it?
Well, Robert and Rebekah Mercer were primary backers of the Trump campaign, and they also owned a major stake in Cambridge Analytica. Giving something like $49 million dollars to Trump and Co.
What are the odds they made a profit on the deal?
There were actual crimes but it was essentially the Russian government hacking email campaigns related to Hillary Clinton and drip-feeding them to the press. On the ad side there's none that I'm aware of.