Matt Levine has a good article [1] about Theranos that goes into the irony of why she got caught on defrauding investors and not the pafients. His hypothesis is that in court of law, it's easier to make the case for damages when it's easily quantifiable (e.g. $10B in damages) rather than 1000 possibly wrong blood tests.

[1] https://www.bloomberg.com/opinion/articles/2022-01-04/slayin...