Themotte is a spinoff from the slatestarcodex subreddit, they used to have a culture war thread every week, which always filled up with (far) right culture war grievances which they then all pretended to talk neutral about. (The effect was mostly that peoples overton window was drawn right). Eventually the stink of it got so bad that Scott Alexander had to take action (he wrote slatestarcodex before he sold out and now runs a substack), so he told them with his semi blessing to go make their own subreddit.

Which was pretty bad, a place where you could said anything (esp rightwing) as long as you used enough words to explain it. (the 14 words did sneak at times, and I saw (sadly didn't archive it) openly neo-nazi homesteaders try to recruit there. So a lot of 'themotte people didn't think they were on the same side as the far right, but the far right certainly did think that'). Etc etc. Eventually the reddit admins got more and more annoyed with the place, and (this is a bit speculative on my part) after somebody got banned(*) for explaining the triple parenthesis dogwhistle by the admins they freaked out and made their own site.

*: A thing I noticed at the time, which themotte people didn't this guy who got banned was from Germany, which has a little bit stronger rules re antisemitism so the admins banning them for that wouldn't surprise me, esp if it was automated. And for the people who don't know, on reddit every forum has mods who come from the forum(called a subreddit), and the site itself has admins, so that is why there is sometimes some moderation conflict. The mods were afraid the admins were about to ban the subreddit, which would destroy all the past content, so they made a new site.

E: also wow themotte has gotten a lot worse when it went offsite. Jesus some of the comments in that thread. I feel bad for TWG.

TL;DR:

What is this, rat-4chan?

Yes