We have collected personal details of most individuals involved in [Tachiyomi] and plan to proceed with strong legal and institutional responses against over 100 forked GitHub pages.¹
It sounds like Kakao Entertainment’s “Global Anti-Piracy Task Force” (P.Cok) might plan on directly targetting the developers, rather than just the project itself ¹ ². Tachiyomi has in response removed all of their extensions except for selfhosted services ³.
I’m not too sure how much of a legal leg they have to stand on, but it isn’t very surprising since Tachiyomi did have a lot of extensions for… dubious sources. It doesn’t seem like they plan on adding back extensions that scrape official sources though.
My guess is they see Tachiyomi as making it easier to access such content (through downloads and library management). I don’t know how the legalities play out, but on their end taking down Tachiyomi inconveniences those accessing pirated content, while being easier than directly targetting the sources.