Does Unicode only accept characters which are in an already standardized or widespread character set?

Company logos are widespread on the web and in icon fonts. 145 of the 585 glyphs in Font Awesome 4.0.0 are brand icons This is one quarter. Of the 2000 icons in the Ultimate Icons Pack 354 are "social logos". Other fonts are similar.

I don't want to see them included in Unicode but I see more arguments for logos in Unicode than for emojis.

I believe countryballs would be a more popular demand ;)

(Damn. Now I want it. Would be a perfect addition to any political discussion. And don't forget about COUNTRYBALL MODIFIER ANSCHLUSS EYES.)