If the Tachiyomi devs don't reverse this somehow (which seems unlikely given what I've read about past cases of this, custom repo it is I guess) they probably just killed the app. Ubless you are aware of how to get Mangadex and bato back Tachiyomi is now a worse option than even just using your browser again for most people.

Seems like the devs even folded like wet noodles wgen they had (to my knowledge) risk free options of at least attempting to prevent this, such as demanding the dmca to be filed with GitHub (saved youtube-dl for example since their repo got reinstated after Google withdrew their claim)

This sort of non-reaction is just asking for the wolves to tear the project apart, after this any copyright holder with no leg to stand on will file claims agaonst Tachiyomi for whatever sources remain. Because why shouldn't they? It's a 100% success rate and they don't even risk anything (illegally) abusing DMCA with people like this at the helm of the project.