At this point, I think we can all agree Pleroma is a social media platform built specifically for white nationalists.
It has intentionally positioned itself as a primary alternative option for hateful people that have been pushed off of Birdland, FB, etc etc.
I would not be surprised if you see them on the news in the near future as a flash point for organization for premeditated attacks against social groups they hate.
That platform has consistently catered to the worst people.