@hD
I think the issue is more that Hussie and other people affiliated with Homestuck had linked to and tacitly endorsed the UHC for a long time prior to everything detailed in the blog post. The contents of Gio's articles weren't heinous enough to invoke a legal takedown then, so what changed? That & the fact that there are a bunch of other mirrors still up, as people keep on very helpfully pointing out, reads to me as a personally motivated DMCA instead of just protecting their copyright. Which is a pretty shitty thing to do.