Many of the mild infections will never be known about (and thus never be counted as a case at all). There may have been no symptoms, or the symptoms may have be

Many of the mild infections will never be known about (and thus never be counted as a case at all). There may have been no symptoms, or the symptoms may have been minor enough that the person thought it was a cold. Because of this the case fatality rate is a terrible metric to use to try to estimate expected deaths, or your own risk if you contract the virus.