Even the Discord and Buymeacoffee page got taken down. This is larger than any other DMCA I know of
Edit: even the Telegram has been nuked. Yup, Telegram
Switching sources def isn't a single button thing, but it's only a few clicks using the Migrate option in the 3 dot menu, it will transfer the progress you had in the previous source and the Anilist/MAL tracking.
Since I use AniChart's website directly I never missed that part being in the app, but it would be cool too.