@BowsacNoodle @deprecated_ii people's personal health data, probably.

There was a time when people understood the right to privacy, especially relating to personal health data, was important. Some people who date from that time are still living

ie it's the same reason that it's probably not good if the government of china has your DNA from 23&me -- whether you have hemeroids or are predisposed to gastric cancer shouldn't be anyone's business especially if you're reporting it to a vaccine database to help ensure that vaccines that you took are safe and aren't causing either.