DWBH: I was kidding. Ish.
The government could easily HAVE all of that data- however, if they were to give it to insurance companies, etc. to use, they would get the pants sued off of them. They may have it, but they can’t USE it.
It’s a bit like how people are nervous about the widespread, newly inexpensive ability to scan your genome. people are nervous that if this becomes normal, people with genes for diseases won’t be able to get medical insurance. Except that there’s a law that even if insurance companies know your disease predilections from your genotype, they can’t use it to discriminate against you in insurance costs.