More than 50% of bounty hunters who use social media as their tool, have accounts created just for that. Meaning they're mostly spam accounts which no one cares about, no one retweets, no one views. And as such is worthless.
And that just amounts to paying promoters for publicity/awareness and getting none of that, this bounty hunters just want to get paid, even if they find for themselves the scapiest means to not do anything but still get paid they will do that, this act does not encourage projects to still follow this means of promotion as they are paying for nothing.
But the truth remains that no matter what happens the role promoters play in this network will always be needed, except a project doesn't want to grow, then they can do without promotions, it has its imperfections but it remains perfect for growth.