[Jamesbeam]

Ok cool, you give me three links.

The first one says

This article is a preprint and has not been certified by peer review [what does this mean?]. It reports new medical research that has yet to be evaluated and so should not be used to guide clinical practice.

The second one has a sample size of less than thousand people and concludes "Self-diagnosis does not accurately predict influenza seropositivity"

The third one is the only one that has a good set of data in terms of sample size ( 50+ Million ) but concludes "Symptom checkers had deficits in both triage and diagnosis" and that said I have no idea if those websites need some kind of verification as well, so if not someone who's bored could have just added bogus data to that as well.

I am not sure what's your point.