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.

1. https://nitter.net/kakaoent_pcok/status/1744889648265175197
2. https://newsroom.kakaoent.com/news/meet-p-cok-kakao-entertainments-global-anti-piracy-task-force/
3. https://tachiyomi.org/news/2024-01-09-extensions-removal