Mitigation 1: Campaigns run by bots. Mitigation 2: Sign up for campaigns outside of forum. While they keep figuring out ways to mitigate this, we've lost a lot of time and effectively accomplished only minor results.
Countermeasure 1: reroute links in their signatures somewhere else? That will for sure stop playing whack-a-manager with alts.
There are always going to be ways to counter something. However, if you do this then you should be permanently blacklisted. It would also get detected quite quickly IMO.
Anyhow, what I'm proposing is an "all-out attack" of the problem:
1) Stricter evaluation and bans.
2) Ban users.
3) Ban managers.
4) Ban services.
5) Negative ratings for all 3 groups.
If you aren't willing to work towards a better environment for everyone, and you are actually making it worse, then why should anyone tolerate you?