The nature of 4chan is to funpost, not to have a serious discussion, so whether anons are retarded or pretending to be retarded is unknown. 

As for what this website offers that Reddit, Quora and Stack Exchange sites don't, the F.A.Q. mentions this site is also supposed to be a proof of concept where you should be able to embed any real LaTeX code into your posts. For example, inserting a simple code snippet like \icode{\chemfig{*6(=*5(-(=O)-O-(=O)-)-=-=-)}} into your post is going to render as

\chemfig{*6(=*5(-(=O)-O-(=O)-)-=-=-)}

When instantaneous post preview becomes available the convenience of formatting your post this way over rendering TikZ pictures yourself and taking a screenshot of them will become obvious.

Not to mention those are corporate sites. They will never allow the things 4chan allows while Mathchan might. There is a demand for a site like this because /g/ and /sci/ have been complaining about their boards for ages. And while /g/ has Lainchan they can go to, /sci/ doesn't have its own alt-chan and this is my attempt of giving them a platform.

>email the admin of https://bvffalo.land/ to catalog your chan for more publicity
I will look into that, but the website is not technically ready yet and it'll likely a year before all the planned features are implemented. This is an early release for \eqn{\beta} - testing purposes (people can freely use Mathchan but expect stuff to be broken) and if chan indexers want to index Mathchan anyway they are also free to do that. Thanks for your suggestions!