Complete Heyuri Internet Domination!!

I am personally fine with it as I believe Heyuri has the best users, see Strange World before it was Heyurized for example: https://ayashii.net/bbs.php?c=08&m=g&f=202103.dat

It was mostly terrible, only good qualities were coming from it being advertised on Heyuri

As for Mattari AA, it was one by a Heyuri user (and presumably for primarily Heyuri, although some Japanese people noticed it too) but its license tells
>Feel free to host a copy of Mattari AA online, modify it, or sell it to your least favorite aunt for $$$ if you want - Mattari AA is FREE software for THE WORLD ヽ(´ー｀)人(´ー｀)人(´ー｀)人(´ー｀)人(´ー｀)ノ
on https://mattari.heyuri.net/readme.txt - so kuz can host a copy of it on his sites if he wishes to.

And as for NC... I believe it wasn't worth keeping online as multiple boards on a separate domain. I won't use the "it was a part of Heyuri before its own" argument since not many current Heyuri users used /jp/ when it was a thing, but there are many of us who can write in Japanese/learning to do so, so I believe its merge would be for the best way for the idea that inspired it (which was having a place for non-Japanese practice Japanese, maybe also with some Japanese people posting, in an informal setting).