I don't think that guys like this one are rare. In fact, one of the most troubling information is how he manages to have 200 accounts
Bots. It's automatic posting so it takes little-to-no effort once they're set up. Most of the bumping services I've seen their posts are just complete generic garbage reworded slightly over their dozens-to-hundreds of accounts so they just load the bots up with whatever crap they can be bothered making and just set it to whatever intervals they want. The previous bots were just posting the same one liners over dozens of accounts and then removing them before they were re-posted.
The issue also is that many bounties are accepting newbies, even brand new users, in their campaigns.
That's why you need to introduce posting restrictions, or to ban bounties.
I think the only way to get rid of the massive spam is banning bounties. On the one hand we will lose attractiveness for those spamming bots but on the other hand a lot of good (in terms of helpfulness, posting quality, ...) posters will be lost, too.
Bounties are the least of ours concerns. At least the junk is confined to it's own board an nobody else outside if there has to see it. it's the stuff that spills out of the alt coin section like crapcoin campaigns that are the issue.