Take the phrase "X Corp has a turnover greater than some small countries". A pedant will want to know the criteria for "small" country, are they developing or industrialised countries, what's the GDP . . . and many other such questions which will actually make the comparison less vague and more useful.
Look at this "Monster" XKCD cartoon that plays with this idea
Do these vague "I'm giving you an impression here but no useful data" comparisons have a name?