When Google acquired and kills of such a similar thing and as awesome and universally useful and (hopefully/seamingly) altruistic initiative as Aardvark (vark.c

When Google acquired and kills of such a similar thing and as awesome and universally useful and (hopefully/seamingly) altruistic initiative as Aardvark (vark.com) was, why do we believe that this new "Helpouts" will stick around and people should invest time and energy in contributing to it?