My thoughts is growth hacking. They would ideally be identifying accounts that have been verified by @ginabot. The hope would be that you have resteem notifications set and potentially follow their account due to the appreciation of the resteem.

tinfoil hat time> As the account builds up a following it can then be transferred over to be a resteem payment account where they will be able to offer something along the lines of send 1 Steem and be resteemed to 5k followers. </tinfoil