Coining a new word:
metacruiting: the process of recruiting recruiters
This actually word has a sound etymological basis. The word “recurit” comes from the French recrute, based on Latin recrescere ‘grow again,’ from re- ‘again’ + crescere ‘grow.’1
So the “cruit” part of the English “recruit” traces back to the Latin “grow”. Metacruiting, therefore, suggests “growth of growth”, or growing at an exponential rate. You would need to recruit more recruiters to grow an organization that fast.