There's a lot of interesting mechanical parts to a large amount of harassment from a small group. Like, one person with a shorter reach, for example, the person doing the trans femme spam reporting, can have almost her entire circle of followers blocked in, well, about an hour. Because that changes the difficulty of spam reporting, it cuts down the participants.
If your circle is larger, it gets more difficult to cordon things off. However, there is a degree of social pressure that impacts the spread of these things. Radfems are a good illustration of this, because we know they are notorious for deliberately misrepresenting trans people as violent (indeed, in their eyes being transgender is enough to be considered violent), pretenting obvious fantasy or hyperbole is literal truth, treating consenting sexual behavior as violence, and so on. Basically, we know radfems lie about trans people, sex workers, and kink. The resultant social pressure means that calling out to harass a trans femme is unlikely to spread beyond radfem circles, although they're fond of sending anons to trans blogs to stir up shit, as well as once in a rare while sock puppeting harassment. So, that limits the spread and you can do an easy containment.
On the other hand, if information is put out by a person with a larger following, or spread by an extremely influential person, it might get past its limitation to radfem tumblr, and be taken as reliable, which is a reason why We Don't Share Callout Posts. That said, an informational post about how to leverage the harassment strategies used by radfems against trans people is the type of information that is not a callout, and doesn't not incur the same sort of negative social pressure as siding with a hategroup. Indeed, in many ways such a post would almost feel like it's important to share, as the amount of online harassment and blog deletion of trans femmes on tumblr is widely known. A generally progressive leaning social media site like tumblr might even want to blow up the post notifications, so that it would hit mass propagation, and make it impossible for the radfems running the harassment campaign to cordon it off. Especially with one radfem blog being so open about calling for people to mass report one blog as spam, and get trans femme blogs deleted, using a tactic that really anyone could use, even as a way to put a guaranteed stop to someone who has by her own proclamation got trans femme blogs taken down in that very way.
I mean a post explaining that, if it went viral, that would make it very difficult to keep harassing trans people.
