There are a few others who are much less prolific. One of these less prolific ones has been active in the past day or so to the joy of the other.
I have people (who are extremely racist or have posted in support of violence to silence feminists) muted and filtered, since I really don't want to see them. I often find their digital droppings when checking out other users' feeds (I check before I decide to follow/filter/mute people) though. I also have several spammers muted and filtered, as well as tinyurl.com which has only ever been used on hubski by an accounthopping spammer. I've also filtered hate site and political FUD domains that I've come across in global.
It's far less prevalent here than it is in other sites. This makes it all the more jarring and visible when it does crop up though. Glad you've not experienced it.
I feel like there's a balance to be struck between free speech and censorship. Clearly, these people do not represent the spirit of Hubski. Lurking briefly on the site reveals this. Shy of having some "global mute" function, an analogue to this description of "global filter", there's no way to completely censor them. And if Hubski did, they'd just make another account and start over. An open and popular forum will eventually expose all the evils of humanity, as featured by users' comments themselves. It was here fairly often even before the recent influx, and unfortunately, I don't think it's going away. The moderation tools given to me seem to suffice for now, but we're not the same person. Neither have we payed Hubski a cent. Yet. Please try not to interpret this as me advocating for them or against you. Neither was my intent.