Oh really, imagine the counter-factual universe where we do. Where does the data come? You log on to HN and hear about how they determined that diabetes is associated with diet soda by linking your store purchases with medical records. Construct a hypothetical comment. What does it look like?

Imagine the front-page of the NYT in that counter-factual world. Imagine the outrage on Twitter. Now, choose to inhabit that counter-factual world by starting the company that does this. Good luck.

There are a lot fewer rules and regs around the sale of detergent, than in the world of medical data / experimentation / research.

There’s an impressive big data symptom analysis going on in the UK through the Covid Symptom Tracker app create by a company called Zoe. They’ve been doing trials comparing reported symptoms with PCR testing.