I think you're just seeing clusters of shitposters for 1xbit or some other shady campaign or members of an alt ring that got busted; I don't think the level of tagging has increased drastically over the last few months or even years (though I could be wrong, as I have no data on that).
Most likely but in recent days, negative tagged accounts are also accepted in different signature campaigns depending on the legitimacy of the feedback. Apart from that, the number of active signature campaigns has increased significantly in comparison to the last 2 years I have observed. That can be another reason probably.
There's only a rare case that negative trust user got accepted on campaign maybe less than base on my trust list depth. The only user I know that got accepted by many campaign was QS and Ognasty despite there negative trust rating is more than. I don't question it since they made contribution in the forum in the past and they didn't steal money on any user here.
But on this case, I believe the opinion on the above post is accurate. 1xbit is the main reason why user posting on gambling has -ve feedback since that campaign pay well and even accept the fact that there participants will later on got -ve feedback.