>>486this problem is very complex.
I'm not sure whether or not I can explain that all right though because I have no confidence in English, but I will do my best.
In addition to
>>488 , As you expected, one of the cause is the conflict between part of 2ch users who hates affiliate blogs (they are called kenmou/嫌儲) and affiliate bloggers, continued from 2012. then, that is a reason why 2ch has been divided into 2ch.net and 2ch.se.
In the middle of March, 2014, 2ch.net revealed all contents on 2ch.net would be forbidden to reproduce to other sites against affiliate blogs. as opposed to this, one who calls oneself the former administrator of 2ch, Hiroyuki, appeared and he founded 2ch.se , claiming anyone is free to reproduce all contents on 2ch.se
(still, all posts on 2ch.se are brought from 2ch.net though)
2ch.se stands for the second 2channel.
in passing, besides 2ch.net and 2ch.se, the similar site called open2ch.net exists.
all contents on open2ch.net are free to use for anyone under Public Domain.