Yes and no. The flu is like the common cold there are many versions of it and most are different enough that just because the body learned how to fight off one it doesn't know how to fight off the other. The flu shot covers the worst of the versions going around. People can still get the flu, its just not the as nasty versions.
That leaves them with statistics from a large number of home users that are more or less computer illiterate.
Things such as my mother-in-law typing in google into the quick search to get to the Google home page so she can search for something
I share your concerns with bandwidth. I constantly stream music at work to listen to, and I worry that I'll get in trouble for bandwidth usage. If I bought every song I listen to (I have quite eclectic tastes) then I'd go broke quickly. In the car I mostly listen to NPR or a book on CD as music tends to give me Highway hypnosis (http://en.wikipedia.org/wiki/Highway_hypnosis) and eventually I become narcoleptic.
I do buy a few albums from my favorite artists, but that probably averages out to one or two a year. Due to storage space and cost I'm very picky about what albums and movies I buy.
Exactly, this is how the human brain works. Exact math is slow, estimates are quick. AI and autonomous things could do very well with this.
Since we're so fond of car analogies here, lets take the autonomous car. The car wouldn't need to know that it is 23.1532 meters away from the car ahead of it. It would be perfectly fine in just knowing that it is around 20 meters away and it can stop in about 15 meters. Of course all this depend on knowing what the significant digits of the calculation are. If said car is attempting to parallel park in a tight space then rounding 6 cm up to 1m would be an issue