Since they rebranded to HiAnime, logging in with ur old AniWatch acc transfers all the watchlist, & other continue watching anime into ur account, so after that they should've taken down any & all domains of AniWatch, so that all the users go on to the new HiAnime.

But since AniWatch is still up, some people started using HiAnime & some are still remaining in AniWatch, which leads to these 2 acting like 2 different websites. Since all the older data were transferred to HiAnime, I don't think there's a point in keeping up the AniWatch domains anymore, take them all down & ensure that the entire user base is on HiAnime now.